Quote:
Originally Posted by Novacek
Now you're talking 5-6 miles of additional _heavy_ rail line, and _another_ river crossing. And even less frequency!
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Whatever type of train they build heading south is going to require another new rail crossing. So a new bridge isn't necessarily going to add additional costs.
5 to 6 miles of new single track heavy rail will almost assuredly cost less than 7 to 8 miles of double track light rail. The heavy rail would most likely be in a dedicated rail corridor, the light rail in dedicated lanes within the existing street. The average speed of the street running light rail trains will certainly not exceed 25 mph on average, the heavy trains should see average speeds well over 35 mph. That proposal is certainly worth studying.
The problem with both proposals is the lack of other ridership besides that generated by the airport itself. The area immediately surrounding the airport to its north isn't developed today. I doubt if many will be willing to develop under jets landing and taking off zones, it's very noisy there. That's why the urban rail proposal initial operating schemes stop miles short of the airport terminal.
Stopping the urban rail short of the airport now is a great idea, imho.
Another important fact I wish to get across is that street running urban rail in downtown Austin isn't going to be very fast. DART's light rail trains in a dedicated street average just 10 mph through it's downtown street mall on Pacific and Bryant Streets. They take 9 minutes to travel 1.5 miles between Pearl and Union Station, and three more additional stations.
METRO's trains in downtown Houston don't go much faster either. It's 1.5 miles between UH-Downtown and McGowen Stations, taking 7 minutes per the schedule, averaging 12 mph. The entire red line takes 50 minutes to travel 12.8 miles, averaging 15.3 mph. DART's entire red line takes 65 minutes to travel 28 miles, averaging 26 mph; including the rather slow 10 mph average through downtown Dallas for a mile and a half. It certainly pays off speed wise to get the trains out of the streets and onto dedicated rail corridors.
Once leaving downtown Austin along Riverside, the average train speeds will increase, but how much will depend upon several factors, station spacing and signal lights priority. Assuming the same average speeds as METRO, 15.3 mph, it's going to take the train over 31 minutes to travel the 8 miles between the convention center at 4th street and the airport terminal.
FYI, CapMetroRail averages 35.5 mph between Leander and downtown Austin, 32 miles and 54 minutes. That's 20 mph faster. In 30 minutes, it should be able to travel 17.5 miles.