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Originally Posted by jsbrook
A++, Mappy! What would such an endeavor cost? No matter. You should really try to get it into the hands of Alan Greenberger, the Deputy Mayor for Economic Development. Or whoever replaces him when Nutter is gone (hopefully in a similarly development-minded administration).
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The Vine Greenway costs are probably really hard to guess at, and Im not an expert at such things anyway, but:
21st-18th: You would think that PennDot should pay for all the caps there. With city coordinating the park space on top of those with any parkway plan they might have and trying to get the Franklin Institute to expand into the new space made availble next to it (perhaps arts/science grants/donors could fund that cap?)
That leaves 8 sections to cap from from 18th-10th. Four of them would be street level plazas or parks with improved pedestrian corssings/access, and ramps to/from the elevated trails. the other four sections would simply be large planters with trees/bushes/flowers/etc with hidden exhast vents traffic below, and estentially a wide pedestrian bridge over it, and through the thick greenery.
Those Four street level plazas could have themes (10/11th St Chinatown, 16/17th Mormon sponsored, etc) and could be tied to adjact development properties. Especially if the Land Bank can leverage any city owned property, i.e free or super-cheap land if you cap and build openspace on your block. Or allow for variances or fast-tracked approvals if the commit to cap funding.
The planter caps should probably be paid for by PennDot, the city, and federal grants, or other sources, since the elevated trail is esentially bridge infrastructure that should be regularly inspected and maintaned by the city.
The City Line idea (8th/market to Zoo) should probably just be a SEPTA endevor since they own the ridge line, city line, BSL (need a transfer station), and runs lines on the Penn Railroad Bridge already. Ill bet this would be very cheap compared to most subway projects. Its only a 3.5 miles line with more than 3 miles that is (or has been) used for rail already... Maybe under $100million, but the 4-6 new stations might cost that much or more. (very rough guess). Dedicating a line all the way to 30th Street Station would a just require traffic/legistics and would increase the viability even more with tourist arriving by rail.
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I should have done that, myself. 
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