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Another W&C Closure?
asdf wrote:
On Tue, 20 Mar 2007 12:34:07 +0000, Clive D. W. Feather wrote: Yes, that occurred to me after posting. But do Piccadilly line trains really have to use the side tracks? I realize that doing so can reduce delays for eastbound passengers getting off at Acton Town, but it doesn't actually speed up train service much, does it? One train still has to wait for the other before leaving the station. Actually, it can help because of the longer headways needed at stations. Put simply, when you work out the numbers you find that the minimum possible time between trains is longer at stations than between them. With two platforms you can negate this to some extent because one train can be running in to the station with the previous one still departing; with one platform, you can't let the second train in until the first has cleared the overlap. Admittedly, in this case you then run into the bottleneck again at Hammersmith, but having the lower headways at Acton gives you more robustness. It's more significant than that - driver changes take place at Acton, which means dwell time there is often longer than at Hammersmith (etc). Two comments on that: 1. If driver changes were properly managed, there would be no need for longer dwell times. Some of the current changes are decidedly leisurely, even when the new driver is already on the platform when the train arrives. 2. In my experience, full use of the platform capacity isn't always made, causing westbound trains to crawl through Turnham Green in the queue to enter Acton Town. It's ludicrous that a station with extra platform capacity should be a bottleneck. -- Richard J. (to e-mail me, swap uk and yon in address) |
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