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David Harrison |
I've put a quick-and-dirty map of the whole city here.
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Besides, the river corridor on the North Branch is slowly de-industrializing. A better plan is to complete the riverwalk to allow for pedestrians and bikes to flow along the river corridor, and re-establish Clybourn and Elston bus lines. A few decades from now, if dense development takes hold along the river, it may become feasible to run waterbuses beyond the limits of downtown. I suppose it's possible to run the existing water taxis up to North/Clybourn. It's a big shopping/entertainment district and a potential lure for tourists. Everything north of there is industrial or institutional. |
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David Harrison |
My Snowflake Notes: Why and Where of the Chicago "L"
I have put together a short essay from my notes that I compiled for my narration on the IRM Snowflake "L" Charter and I am sharing them in hopes that you find them interesting and educational.
Snowflake Notes...The Why and Where For Chicago's Elevateds If you've ever flown into O'Hare or Midway at night, you've marveled at the grid patterns of light, the illuminated squares, the end result of a land use policy that divided our area into square miles called sections of land. The first surveying was done in conjunction with two Indian Boundary Lines, that marked a twenty mile corridor for a planned canal in the early 1800s The north line is clearly marked by streets and crossed by the Blue line after the Jefferson Park station, but the most familiar crossing is by the Red/Purple lines just south of Howard St. Within the city limits, the south line is almost invisible, marked by a few stretches of chain link fencing and an obscure street near 127th St. If extended, it will be crossed by the Red line extension. The sections inside the Canal lands and the sections outside on both sides of the Boundary lines were sold and then subdivided into half sections and quarter sections, even down to quarter-quarter sections...the proverbial forty acres. All the subdivisions had to be further divided into blocks, eight of 'em to a mile is the accepted standard. But if both your streets and avenues are divided like that you end up with square blocks with a big unused space in the middle. So you have to run half block streets in one direction with paralleling alleys and then there is no unused space and you have rectangular 1/2 blocks. Because streets along the section and half section lines are generally heavily trafficked arterials and more valuable, "T" alleys are formed behind them so that the lots face those valuable streets, even along diagonal alignments. Three of the four elevated railroads chartered and constructed in Chicago; The South Side, The Metropolitan West Side, and The Northwestern were required by their franchise ordinances to only build "through the blocks." They could buy, lease, rent, a private right of way, but they could not build over streets or alleys. They could cross them, of course. If the half block streets and their accompanying alleys parallel the route, the cheapest way to go was to usually buy the back 25 ft of backyards next to the alley. If the alleys were perpendicular to the elevated, a more expensive purchase of entire lots was needed and the lots had to all be in a row. Usually the "L" selected lots at the quarter points so that if the next subdivision was oriented at right angles, the "L" easily slid across the boundary already positioned next to the alley. The first "L", the South Side broke ground next to the alley at 25th St., just east of State St. The right of way for the most part was strung out on the west side of the alley, except in between 14th and 12th Sts. where the line crossed to the east side of the alley. The South Side was stymied trying to purchase needed land north of 12th St. The property owners did however agree to sign consents for the "L" to build over Victoria, an alleyway with a name, known today as Holden Ct., so the city agreed to modify the charter. Although the franchise stipulated that 39th St. was the end terminal, before the tracks reached that point the Jackson Park Worlds Fair site was selected as the new end point. 39th St. was the city limits when the original charter was granted, but the new city limits had leaped to 138th St. in one fell swoop. The South Side chose the alley east of Prairie Ave. probably because the alley east of State was built up almost all the way to 63rd whereas the Prairie alley was mostly vacant . Plus to go behind State St. would encounter two large cable car buildings. The "L" crosses from the west side to the east side of the alley in the 4800 south block. My thinking is they did that to avoid jogs to match up with shifts in the alley locations south from that point. Between 51st St. and 56th St., there is no alley. The east orientation also made the 61st St. yard a simple fit. Only one jog was needed to match a shift in the alley....at 57th and 58th Sts. A half block center track just north of the only island platform was put in at 58th St. Approved branches south to 71st and west into Englewood would have to wait, the first goal was getting the line to Jackson Park and the charter specified building through the blocks anywhere between 60th St. and 67th St. The South Side discovered building over 63rd St. to be a bargain....there was little development west of Woodlawn Ave. except for the thoroughbred race track. Property owners easily gave their consent, and the city agreed allowing the "L" to build a three track structure that included the spidery steel work over the raised embankment of the Illinois Central railroad. The entire extension from 40th St. to Jackson Park was built in under ten months. The east-west alignment alongside the Chicago Junction railroad would easily connect with two future extensions: to Kenwood and to the Stockyards. The exception to the "build through the blocks" was the politically connected Lake Street Elevated. The charter specified "build along and upon" and the elevated was constructed using the street as a right of way and no signatures were ever solicited. But neither the city nor the railroad was bold enough to build east of Market St. so proper signatures were gathered and the over the street elevated won a charter east as far as Wabash Ave. Along most of Lake St., the cross beams were wide enough to allow an express third track to be added. When the street is your right of way, there is not much that can intervene in planning your route. Had the Lake Street built any of its chartered branches, they would have been built on private land conforming to a "build through the blocks" clause. The third company on the scene put together the largest operation to date, a main line and three branches and all of it was built on private land. The Metropolitan West Side even brought their four track mainline to the edge of the Loop. The Met's four track main was constrained by Jackson and Congress east of Halsted; Van Buren and Harrison from Halsted to Sacramento Blvd.; and Adams and Polk from the boulevard west to the city limits. Because of the extra number of blocks in the sections of land between Madison and 12th Sts. going west of State to the city limits, the blocks were more square than the typical rectangular city blocks with some lots having depths so deep that the "L" modified the customary "back of the lot right of way" and went through backyards with the garages on one side and the houses on the other. I would love to see photographs of those "L" structures. The Congress Superhighway obliterated all traces. The extra wide blocks gave the Met room enough to put their shop building and powerhouse in between the two pairs of the four track main. The four track main ended at Marshfield station, a half block west of Ashland AV and branches broke off in two directions: the Douglas Park directly south and the Logan Square directly north. The Garfield Park, now only a two track main continued straight to the west. But at Sacramento the two track main shifted its east-west alignment two blocks to the south for reasons I haven't found yet. Both the Douglas Pk. and the Logan Square branches to the south and north were located in the typical back of the lot, along-side the alley, right of ways, along with 1/4 block land purchases when the alleys ran perpendicular. Several railroad crossings utilized masonry and concrete structures beneath the iron "L" structure and the branches crossed already raised steam railroad with majestic truss bridges. On the Douglas branch was an exception: where it went over the Burlington railroad on a tight acute angle crossing that simply used extra long reinforced bent beams in a design so strong it was left unchanged in the Douglas rehab a few years ago. The north-south alignment of the Logan Square branch is almost all gone north of the overhead crossing of the Lake Street elevated near Paulina. I say almost because the 1894 era bridge that carried the "L" over the C&NW railroad tracks still stands today because the railroad has signals mounted on the structure. Not only is it the oldest surviving "L" truss bridge, it or the South Side Jackson Park east 63rd truss bridge was probably the longest ever built in the city. When the Logan Square reached the diagonal Milwaukee Ave., the "L" followed a course parallel to Milwaukee, alongside the alley, a routing distinguished by a speed reducing kink at North Ave. where the "L" adjusted to property lines. Just beyond this kink the now demolished Humbolt Park branch went west, again, alongside an alley but it never reached its franchised end point of the city limits. The fourth company had the least restrictive charter. The Northwestern Elevated could start at Monroe, in between Wabash on the east and Market on the west and build north, cross or tunnel beneath the river and then build anywhere east of the North Branch of the River and west of Cass (Wabash Ave.); it could build and build, until they reached the city limits. Just do it all on private land. The Northwestern laid out a four track main line, featuring express and local tracks patterned after New York City. The entire structure used tower bents, which by 1900 had become the standard engineering style. But making room for the Northwestern's four track elevated at the rear of lots left little room for buildings on the remainder of the lot. From the end point at Wilson Ave. they paralleled the Milwaukee steam railroad south to Graceland (Irving Park). From Graceland to Willow, the structure basically follows the alley east of Sheffield. But the almost three mile stretch has more kinks, shifts, jogs, than anywhere else on the city's "L" especially north of Diversey because the tracks constantly adjust to the alley location, constantly adjust to varied property lines when the alleys are perpendicular, plus, throw in lot lines aligned to the diagonal Clark St. near Roscoe. And not to be overlooked, are other highlights like the curves near North Ave. and Halsted St., long rumored to be caused by property owners who demanded too much money and the "church curves" where the Northwestern swung its right of way around St. Joseph's Church, just south of Division. Uniquely, both of the east-west alignments corresponded to proposed branches never built, but the proposed branch leaving the main at Graceland finally appeared as the Ravenswood leaving the main at Roscoe. The east-west tracks south of North Ave. are mid-block to align with a short street. But getting to the Loop over private property proved impossible and the Northwestern petitioned property owners for permission to use streets. With consents in hand, the elevated received new franchises allowing an "L" structure over N. Franklin and N. Wells continuing onto Fifth Ave. (Wells Ave.), but only allowing two tracks which would continue to be a bottleneck down through history. The four sided Loop was completely constructed over streets, sometimes after bitter fights for consent from property owners. The last Van Buren side was built using a ruse of chartering a mile long elevated from Halsted east to Wabash, but only building between Market and Wabash. It was easier to get consent signatures from industrial frontage owners in the west half of the mile than from the residential, commercial and retail owners in the east half. A simple majority, 51 percent approval from all the property footage along the entire mile as a whole was all that was needed. Perhaps to validate this ruse, the downtown "L" was numbered using the "proposed" Van Buren elevated as the origin. When the numbering got to Lake & Wells, Tower 18 was named. The downtown elevateds used a lattice design for stringers to let in more light at street level while opponents with the strongest objections held out for curb line upright supports along Van Buren and along Franklin. When the Northwestern opened in 1900, this early stage of the Chicago "L" system still had much expansion ahead. (to be continued) David Harrison |
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http://images.ookaboo.com/photo/m/Fl..._ca_1898_m.jpg source |
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David Harrison |
The stability of the structure would depend on the size of the underground footing. Miami's elevated has a similar design with separated tracks, although it's from the 80s and built in concrete.
Unfortunately the Van Buren property owners lost their battle... and for the last 100 years, Van Buren has been an unattractive sewer of a street (Wabash is much nicer). |
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I'm pretty sure that Van Buren would be far better off today if it was identical to Wabash. Then again, Lake isn't much better, crowded with garage exits and ventilation grilles. |
I don't immediately find a contemporary source, but I've always read that the bents span from curb to curb on Van Buren because the businesses located there had the clout to force Yerkes to build it that way. The drawbacks of posts in the street—especially in the days of horse-drawn wagons—were already quite apparent on Lake Street. Buildings such as the Fisher, Old Colony, Katahdin (Monadnock), LaSalle Street Station, Rialto, and Van Buren Building testify that it was not always a street of flophouses and tax-payer blocks.
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^ I looked deeper into this and I want to update my position. Although Van Buren suffers from short blocks interrupted by alleys and intermediate streets, from the fortresslike trading buildings, from a lack of more upscale tenants that are found on Wabash, and from what I believe are narrower sidewalks, it seems clear that having the el supports at the curbs substantially amplifies the tunnel effect for pedestrians and drivers. Even with the track infrastructure being identical to Wabash (i.e. just 2 tracks above), those "bents" (if that's what the supports are called) have a huge imposing effect when they reach out as far as the curbs. Maybe the biggest problem is that the horizontal beams are very deep (by which I mean "tall", like easily 48 inches?), and because they are spaced frequently (like every 10 yards maybe?) they really obstruct views. Walking or driving down Van Buren, the field of view is completely eaten up by them, and of course they block sunlight illuminating the sidewalks and storefronts as well. In comparison, Wabash is really not bad at all -- it's almost a quaint balance between overhead el and sunlight and open sky.
I hope if there is ever any need to reconstruct the substructure of any of the 4 sides of the loop, extra money will be spent (because it's the historic loop and it's just a few blocks) to use steel spans of the maximum length and of the minimum thickness practicable. But barring that, as far as Wabash is concerned, I'd rather have it stay with columns in the streets than see it turn into a Van Buren. Apologies in advance to the auto collision insurance companies of the world. (State-Lake and maybe a few other intersections are an exception -- columns in the middle of intersections are definitely not a good idea.) |
Well, the city could remedy things some with design guidelines. A sidewalk setback would do wonders, but the dark color of the buildings is also problematic, and so are the block-long blank walls.
The LaSalle/Van Buren station is also a big problem - its mezzanine and platforms block light for a 2-block stretch. It has the lowest ridership of any Loop station, and that ridership would be low even for a neighborhood station. I know CTA has some lofty plan for "2 stations on each leg of the Loop" but is this station still needed? Service to the area is already provided via the Blue Line, which serves both sides of Congress. The elevated station doesn't even provide any transfer opportunities that can't easily be accommodated elsewhere in the system. |
Have they considered another North-South Subway along the Dense Lakeshore drive corridor?
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^Often discussed by fanboys but no serious consideration since the early 80s.
The corridor is already well-served by an array of express buses that provide one-seat rides for many patrons. In addition, a line right along Lake Shore Drive would be a single-loaded corridor, with no ridership originating east of the line. That's why plans always talked about a line under Clark or Broadway rather than Marine/Lake Shore Drive. |
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Van Buren is only 66 ft, where as Fifth Ave. (Wells St.) and Lake St. are 80 ft wide. Wabash looks the best of all....Wabash is 100 ft wide too. N. Franklin is listed as 67 ft, but streets on either side are listed as 80 ft, so the sixty-seven might be an error. Some research is in order. David Harrison |
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That's pretty good, although I'd run it west down Oak then north up LaSalle with a Red Line transfer at Division.
A lakefront light rail line has also been proposed, which I think is a better use of money - express buses would continue to operate during rush hours, possibly sharing lanes with the light rail. |
^ Not that I think we'll ever see this subway in our lifetimes (too much money needed for rehabilitation, southward red line extension, orange line extension to Ford City Mall, possible yellow line extension to Old Orchard, and preferably a brown line extension from Kimball to Jefferson Park), I added in your suggestion as option #2 to my map.
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What are the chances of a new subway similar to that? Realistically it's a bit of a long shot due to the costs, but in the last plan that included it, the other aspects of the plan were to extend the Blue Line to O'Hare, which happened, to build a route that became the Orange Line, which happened, and to extend the Red Line south, which is under serious consideration and planning, The differences between the ones that got done and the ones that didn't are primarily cost. The Orange Line runs mostly on old freight ROW, and the Blue Line extension is in an expressway median. I think there'd be interest if there were funding, but there's not really any cheap way to run a Clark/Broadway subway. |
LSD offers plenty of parkland in which to freely build tracks and stations and to stage construction. Virtually all east-west bus lines terminate at LSD or nearby.
The opportunity to build a fully-separated guideway is rare. Running LRT anywhere else would require street running and building heavy rail would be too expensive. Perhaps a busway with stations might be better for the lakefront, though, as it would upgrade the existing situation. |
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Davd Harrison |
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Putting rail in the park itself is a bad idea because a) it's a further walk and b) it's stealing parkland and would inevitably result in lawsuits against the city under the lakefront protection laws. The only non-subway improvement that I think might be worth tolerating - and even then it would likely be challenged in courts - would be to add enforced bus-only lanes on LSD with separate on/off ramps that let buses bypass the lines of cars at the intersections. That would have a real improvement for rush hour ridership times and allow buses to go through the neighborhoods, picking up riders as locals until they hit the Drive and run express downtown. Done right, you might add stops every miles or two for routes that enter the drive further from downtown. But those would be primarily transfer stations, where, for example, someone could ride the 147 from Sheridan and Granville to Fullerton and then transfer to some bus going to DePaul, and on the return trip, transfer back to the 147. With the additional stops, it might make the buses less express, but hopefully the other improvements would offset that additional time cost. A plan like this should probably also include bus-only on/off ramps being added at Diversey and Addison. If you made certain lanes on Michigan bus-only between Oak and Superior, then made Superior between Michigan and St. Clair bus-only and St. Clair completely bus-only south of Huron, and then connected St. Clair to North Water, you could get buses off most of Michigan Avenue and improve ride times from Water Tower to the Loop while also improving car travel times on Michigan Avenue. At some point, maybe you could even make all the buses on that route trolley-hybrids so they could shut off their diesel engines along the LSD bus lanes and St. Clair - the air would be much better along that whole corridor and you wouldn't have to clutter up Michigan Avenue's sky. |
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Having transit service on Michigan, especially at such an incredibly high service level, is a huge catalyst for development and I'm not sure it would have the same effects if it was out-of-sight on St. Clair. Doesn't NMH also use St. Clair for emergency dropoffs? |
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David Harrison |
Yeah, the single-track segment seems like a very thinly-veiled ploy. What kind of purpose would such a segment serve, when the Metropolitan L ran in parallel?
It's interesting that the worst fears of the Van Buren landlords turned out to be true. All of us here reflexively dismiss community opposition as baseless NIMBYism, but on Van Buren the construction of the elevated has kept the street in a state of constant blight for over a century. |
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Dear Transit Nerds near and far, here is some information about an upcoming rail orgy.
CTA's Purple Line viaduct reconstruction project looks ready to install at least 3 viaducts very, very, very soon. At Dempster Street, and also at one crossing north of there, and also at one crossing south of there, entire new steel viaducts have been pre-assembled/constructed a couple dozen yards from their respective crossings. They are sitting there like an armada of spaceships, in the middle of closed streets or supermarket parking lots, just waiting there (and probably telegraphing "All your bridges are belong to us" if we humans would just stop our quarrels and listen, dammit). For all one could tell, they may well be installing them this weekend, seeing as Friday night to Sunday morning closures are common for major CTA trackwork. Although I wouldn't know whether they have enough work teams to do them all in a single weekend. I don't know how Union Pacific is handling their North Line viaduct replacements, but these should be kind of dramatic because it seems here they will hoist up the entire viaduct and move it into place. So there should be some rare video/photo opportunities very soon, including a very last chance to photograph some of those historic 100-year-old (crumbling, and then braced-up) concrete viaducts. |
^that's how they did the Rock Island viaducts last summer. I have some photos of the old 33rd street one coming down and the new one going in.
I saw maps with Oakton and Morgan marked on them today for the first time! I'll probably make a trip up to check out Oakton next week sometime. |
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I wish there was more of such discussion around here |
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I agree that having the transit right on Michigan has benefits, but it's so slow sometimes. It would be ideal to have a bus-only Lower Michigan that essentially merged with LSD after Oak. I'm guessing that would be terrifically expensive and have difficult engineering as there must be pretty massive amounts of utilities under Michigan. |
I like ardecila’s idea of transit in median-running lanes along Michigan—although Michigan’s about as pedestrian-friendly as a huge, auto-centric boulevard can be, I think the calming effect from taking away a couples lanes of traffic would help make the streetscape a little calmer. Furthermore, there’s ample roadway capacity north of the river, and I suspect a fair amount of the traffic on Michigan just heads onto a side street to get into a parking garage or on-street parking there. Plus, buses are really slow on Michigan during rush hours—briskly walking I’ve outrun buses from Tribune Tower to Chicago Avenue.
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As I think more about the idea, I'm less enthused about it. The current setup has staggered stations that help assign the vast numbers of people who want to ride a bus to the vast number of bus routes that traverse Michigan. A bus that stops to pick up passengers can be passed by other buses in any number of lanes.
The only way to preserve this level of service would be to create a 4-lane busway or, at the very least, 3 lanes at stations. Switching to consolidated stations would create a problem, because the combined rush-hour frequency of all the bus routes together would quickly stack up buses. How do other cities accommodate this problem? Seattle has a bus tunnel, but the station platforms are long, they can berth several buses, and there is a passing lane in the center. Busways in other cities tend to be built in lower-scale areas with lots of room to spread out. |
The new Oakton Yellow Line station opens this Monday!:banana:
http://www.egovlink.com/public_docum...ter%202012.pdf |
From our alderman:
Alderman Cappleman, 46th Ward Applauds Funding for Sheridan Red Line Station April 27, 2012 (CHICAGO) - 46th Ward Alderman James Cappleman commends Senator Durbin, Congresswoman Schakowsky, Congressman Quigley, Governor Quinn, and Mayor Emanuel as they announced today that the Sheridan station is slated to receive approximately $17 million for major renovations. Alderman Cappleman stated, "The key to any thriving urban neighborhood is safe, clean reliable public transit. With the Sheridan Red Line station renovations, we'll increase public safety, create a more attractable area for economic development, and reduce the number of cars on our crowded streets. Additionally, this plan will bring many needed jobs to Chicago." He added, "The Sheridan Redline Stop is one of the northern stations that has needed improvements for a long time. These renovations will help residents, business owners and Cubs fans alike." The Sheridan Station renovation is a part of a $1 billion overhaul that includes federal, state and local funding sources for the Red Line from its northern end to the 95th Street station. The complete reconstruction of the Wilson station and upgrades to the Lawrence stop are a part of this investment, which includes several individual projects to improve stations, tracks, viaducts, and power and runs from this year to 2015 that includes federal, state and local funding sources. The funding breakdown for the $1 billion overhaul is: $702 million in State funds from the Illinois Jobs Now program $256 million in federal funds $44 million in local CTA and City funds |
We already knew this, but I don't know if I'd seen a specific dollar amount:
CTA to close seven North Side Red Line stops for repairs Seven century-old stations on the CTA’s Red Line will close this summer and fall for six-weeks at a time — beginning with Granville on June 1—to make way for $86 million in repairs to upgrade every aspect of the passenger experience. The Granville closing will be followed by similar, six-week closings at: Morse (June 29); Thorndale (Aug. 17); Argyle (Aug. 24); Berwyn (Oct.5); Lawrence (Oct. 14) and Jarvis (Nov. 9). No two adjacent stations in Rogers Park, Edgewater and Uptown will be closed at the same time. In some cases, shuttle buses will be made available. In other cases, passengers will be asked to walk a few blocks to the next open station to make way for improvements ranging from viaduct and platform repairs to new lighting, floors, doors and windows and waterproofing for stations that leak like a sieve. “These are literally the worst stations in the system…It’s been a source of frustration over the years that they’ve been neglected….We are attacking that problem—finally,” said CTA President Forrest Claypool. |
The news about Sheridan is welcome. I wonder what "advanced engineering" it needs? Assuming the track geometries work out, it would be great to shift the Red Line tracks outward and build an island platform that's twice as wide as the existing ones.
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http://www.flickr.com/photos/paytonc/4833132030/ Buses stop every other block, and weave around one another. (Someday, I should try snapping a photo of its operation from one of their skyways, but I always forget about the skyways when I'm there.) The Ottawa transitway system has four lanes to allow passing; the one downtown segment where it gets funneled into a single lane gets terribly congested: http://www.flickr.com/photos/ottawab...719950/detail/ |
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That plus fare-paid zones would greatly speed up buses... But each bus stop already has 50 or 60 people at rush hour. I don't know if there's enough sidewalk space to for hundreds to wait at huge consolidated bus stops.
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Train buffs derailed on elevated CTA tracks in South Loop
Train buffs derailed on elevated CTA tracks in South Loop
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CTA and CDOT are hosting an open house tonight for BRT (bus rapid transit). The Jeffrey Corridor and Central Area Transitway will be discussed. The Western BRT will also be discussed, although it's probably still in very early stages, and full details for that project will not come out until summer.
The meeting will be at the Chicago Architecture Foundation, 224 S. Michigan, from 5-7:30pm. http://www.activetrans.org/blog/bren...p-week-may-2nd |
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