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Post by jamesb on Apr 24, 2017 21:17:33 GMT
As a passenger, I am curious to know why a signal failure at Willesden Green necessitates a suspension for such a wide area - i.e. Waterloo to Wembley Park.
The next southbound train at Waterloo was in 15 minutes, yet there was a train sitting on the northbound platform. I suppose it is not possible to reverse that train from the northbound platform to run back to Stratford?
I am sure that everybody (LU staff) were working hard to resolve things and were working to minimize disruption - so this is not a criticism of them - just a general curiosity.
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Deleted
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Post by Deleted on Apr 24, 2017 21:20:53 GMT
The next southbound train at Waterloo was in 15 minutes, yet there was a train sitting on the northbound platform. I suppose it is not possible to reverse that train from the northbound platform to run back to Stratford? There is a trailing crossover north of the station at Waterloo meaning that reversing north to south requires a mainline shunt from the northbound main back into the southbound platform. Regarding the rest of your points I'm not too sure, but it's worth pointing out that 'signal failures' in the TBTC era can be a bit different to traditional signal failures. |
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Post by banana99 on Apr 24, 2017 21:39:35 GMT
It happened twice. Just restored the service. Got from LB to GP and the service was suspended again. There were also issues this morning, where they related?
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rincew1nd
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Post by rincew1nd on Apr 24, 2017 22:01:14 GMT
Isn't Willesden Green the transition point between two control areas? If so this may contribute to the quite large service suspension.
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Deleted
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Post by Deleted on Apr 24, 2017 22:03:06 GMT
Isn't Willesden Green the transition point between two control areas? If so this may contribute to the quite large service suspension. I thought the boundary was just south of Kilburn? If you're right, though, that could well have a lot to do with it =) |
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Post by tubetraveller on Apr 25, 2017 1:15:01 GMT
I suspect it was a TBTC failure for that large an area to be affected, though I don't have my paperwork with the boundaries to hand.
Assuming this was just a points failure, Wembley Park is the easiest point to reverse trains to the north.
West Hampstead sidings are behaving funny at the moment, so it would take too long there.
Technically trains can be reversed at Finchley Road but my guess it would take too long to detrain, or they don't have the staff to cope, or they can't use the crossover with another train in the platform (I've never seen it used)
Charing Cross can only be used in the other direction
Waterloo is the next option
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Deleted
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Post by Deleted on Apr 25, 2017 1:45:42 GMT
Technically trains can be reversed at Finchley Road but my guess it would take too long to detrain, or they don't have the staff to cope, or they can't use the crossover with another train in the platform (I've never seen it used) I've been over it, though only ever in the other direction. |
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Post by bruce on Apr 25, 2017 8:09:39 GMT
"West Hampstead sidings are behaving funny at the moment, so it would take too long there."
Is this a new technical term?
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Post by jamesb on Apr 25, 2017 8:30:43 GMT
I vaguely remember that the signalling system was at one point planned to allow bi-directional running, but this was changed to simplify it (and reduce costs) at the time that it was installed? Would this make any difference to aid recovery at time of disruption? Would more cross-overs make any difference?
In 20 years time, when the system is old, it would be pretty disruptive to have these failures occurring more often.
There doesn't seem to be much 'damage limitation' built into the TBTC system - although once the whole thing is working again, severe delays quickly turns to minor delays.
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class411
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Post by class411 on Apr 25, 2017 9:01:09 GMT
"West Hampstead sidings are behaving funny at the moment, so it would take too long there." Is this a new technical term? They insist on doing 5 minutes of stand-up before changing. sigh; you just can't get the track these days. |
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Post by tubetraveller on Apr 25, 2017 12:47:53 GMT
"West Hampstead sidings are behaving funny at the moment, so it would take too long there." Is this a new technical term? They replaced the points leading in and out of the siding so trains could go over them faster, but now they don't always clear when you reach the stopping point, especially in RM. For the time being we have to call up the signaller and check before we change ends and potentially move forward to overshoot the stopping point |
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Post by Tubeboy on Apr 25, 2017 14:02:06 GMT
There was a power outage which knocked out the signalling communications. Signal loops at Kilburn were affected, hence the area of disruption.
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