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Originally Posted by billybob123
Thanks for the explanation. I must be missing it but why would a subway do better than 7 Ave? Is it because the trains would no longer have to wait at intersections? I thought that the reasons you list above for delays and reasons for no short-turning would be the same above and underground.
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Oh, although not outlined in my post above, the reason is because the 8th Avenue Subway will only have one of the lines (likely South <=> Northwest) operating in it, while the other line (Northeast <=> West) will continue to use 7th Avenue. I probably gave the impression of overstating the short-turning at any of the terminus stations (other than 10th Street). 7th Avenue is the real bottleneck due to the interlining of 2 routes. Separating the 2 routes theoretically doubles potential capacity. Taking away having to stop at red lights, and also likely fewer stations in the subway should also allow for some additional capacity for the South <=> Northwest line.
The reason why short-turning at 10th Street can be problematic is because of the proximity to the interlocking with the northwest line. If trains have to wait for another short-turning train to clear the 10th Street Station, that potentially makes the waiting trains back up into the shared part of 7th Avenue. Also, since there are no tail tracks at 10th Street West, trains can't really come online there by queuing behind the station. This will be solved by West LRT.
Quote:
Originally Posted by billybob123
Your post gave me a headache imagining how some transit planner had to run schedules, numbers, and spatial reasoning to figure out how many trains can go through downtown and still have short-turn trains. Does Calgary Transit have one of those awesome lights-on-the-wall train planning office like Walter Matthau's (and Denzel in the new one) character did in Pelham 123? I think I watch too many movies.
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I haven't seen either movie, but there is something like that. It is shown from 1:33 - 1:46 of this video.
That is at the Victoria Park control centre. These operations will be moving into one floor of the mixed use building being built as part of Westbrook Station when the West LRT opens.