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Post by Colin D on Oct 2, 2015 11:50:17 GMT
...trough closed stations. After a couple of trips through Tottenham Court Road on the Central Line I was wondering what or if there is any difference in the way closed stations are treated on ATO lines verses manually operated lines. I seem to recall from my days as a motorman that we had to reduce our speed too 5MPH due to the short overlap of the station starter. Does this still hold true for ATO operated lines?
The trains did slow down going through TCR, just not sure if that was because of Crossrail work or if the 5MPH also applies too ATO lines.
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Chris M
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Post by Chris M on Oct 2, 2015 12:36:16 GMT
I can't immediately find it, but this was discussed somewhere a couple of months back. From memory, on ATO lines the trains do slow down but not as much as on conventionally driven lines - 15km/h (9.3mph) is a figure that comes to mind but I'm not sure if that's correct.
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Post by Deleted on Oct 2, 2015 14:41:37 GMT
I seem to recall from my days as a motorman that we had to reduce our speed too 5MPH due to the short overlap of the station starter. This is correct (for manually driven lines). Also, in some locations, the overlaps of some of the following signals are calculated based on the assumption that a train has stopped at the station and therefore isn't approaching at full pelt - since it won't have had time to accelerate up to full line speed yet. As for ATO lines, the situation on the Central is discussed here. In my experience, the train has always slowed down and passed slowly through stations, including stations which were closed during the strikes (so not just stations where work may be taking place nearby). It is worth noting that the Central line does still have overlaps, because the ATP system is primarily reactive - putting the brakes on when it detects the train is overspeeding, not to prevent the overspeed in the first place. The equivalent of a red signal is a maximum safe speed of 0 and, if the train is not doing 0 mph, the overspeed will be detected and the train will be halted, but the system doesn't quite prevent the train from entering a block with a maximum safe speed of 0 (that is, having a SPAD, basically), in the first place. However, that said, it is not, I believe, entirely reactive and I gather it can interfere if it detects that the train is not slowing sufficiently after receiving a target speed of 0. Also, the target speed is often stepped down somewhat gradually, so that you often don't approach a red signal (or block marker board) at full line speed. As for the Jubilee (and Northern, I presume), an LURS article says this: |
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Post by philthetube on Oct 3, 2015 0:49:33 GMT
On the Met north of Finchley Rd most stations can be run through at line speed, 50/60mph, with the exceptions of Harrow, Ricky, Amersham (platform 2 only) and Chalfont s/b from Chesham
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Post by Deleted on Oct 3, 2015 1:40:18 GMT
On the District between Ravenscourt Park and Chiswick Park non stopping trains can do 25mph through the platforms and line speed between Wimbledon Park and East Putney. I recall from my days on the Met non stopping trains trains must slow down to 25mph on the local line between Harrow and Wembley Park.
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Post by Colin D on Oct 3, 2015 7:14:52 GMT
Thanks for the help, The links that tut gave are excellent, thank you. |
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Post by crusty54 on Oct 3, 2015 9:14:27 GMT
It also depends if the platform has been hoarded off for platform works on the ATO lines. Less need to slow down for the long term closures.
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Post by spsmiler on Oct 3, 2015 20:54:13 GMT
In the 1980's I travelled on a Central Line train which non-stopped Stratford - without slowing down. This was on Boxing Day and the station was controlled by BR - who were not operating any trains that day.
Simon
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