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Post by Deleted on Aug 9, 2012 7:40:15 GMT
A few questions about the Victoria Line's new signalling.
Has the stopping point on approach to Brixton and Walthamstow crossovers (when crossover is occupied) been moved closer to the crossovers, if so how close?
Also, is the stopping point behind trains occupying platforms now closer than before, again what is the approx. distance?
Thanks.
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Post by seaeagle on Aug 12, 2012 13:06:57 GMT
Roughly speaking the stopping points outside of Walthamstow and Brixton are about 15 foot closer. And generally trains now get closer to each other than before, but there are one or two places where the train will stop as before.
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Post by Deleted on Aug 13, 2012 10:03:03 GMT
Roughly speaking the stopping points outside of Walthamstow and Brixton are about 15 foot closer. And generally trains now get closer to each other than before, but there are one or two places where the train will stop as before. Thanks for the reply. I'm surprised that the crossover stopping points weren't moved significantly closer now that there is a 20kph speed code. Roughly how far is the stopping distance behind trains berthed at platforms at central area stations? Thanks. |
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Post by Deleted on Aug 13, 2012 17:08:40 GMT
Thanks for the reply. I'm surprised that the crossover stopping points weren't moved significantly closer now that there is a 20kph speed code. There aren't speed codes on the Victoria Line now as such. 20kph was an imaginary point that was chosen to assist drivers in braking to a signal. They no longer have a 20 target speed, they have indications that bring them down the braking curve, kph by kph. The stopping points were moved as close as they need to be to meet the performance requirements. |
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Post by Deleted on Aug 14, 2012 10:42:12 GMT
Thanks for the reply. I'm surprised that the crossover stopping points weren't moved significantly closer now that there is a 20kph speed code. There aren't speed codes on the Victoria Line now as such. 20kph was an imaginary point that was chosen to assist drivers in braking to a signal. They no longer have a 20 target speed, they have indications that bring them down the braking curve, kph by kph. The stopping points were moved as close as they need to be to meet the performance requirements. Thanks for the explanation. Do you happen to know what the performance requirements were for Brixton (such as the RORI)? |
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Post by Deleted on Aug 14, 2012 19:17:50 GMT
I do. The target was a RORI of 79s for both platforms.
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Fahad
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Post by Fahad on Aug 15, 2012 0:18:41 GMT
RORI?
Googled - platform reoccupation time, for anyone else who didn't know
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Post by Deleted on Aug 15, 2012 7:04:10 GMT
I do. The target was a RORI of 79s for both platforms. Thanks for the info.  Assuming the target matches reality, then Brixton's crossover should not be any more of hinderance to achieve 33tph than it was to achieve 28.5tph with the previous trains/signalling. |
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Post by Deleted on Aug 15, 2012 20:08:40 GMT
I do. The target was a RORI of 79s for both platforms. Thanks for the info. Assuming the target matches reality, then Brixton's crossover should not be any more of hinderance to achieve 33tph than it was to achieve 28.5tph with the previous trains/signalling. Reality is a few seconds above, but Brixton still isn't the constraining factor. |
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Post by Deleted on Aug 16, 2012 11:00:41 GMT
Thanks for the info. Assuming the target matches reality, then Brixton's crossover should not be any more of hinderance to achieve 33tph than it was to achieve 28.5tph with the previous trains/signalling. Reality is a few seconds above, but Brixton still isn't the constraining factor. Would that be Victoria NB (am peak) by any chance? I know that the WTT uses 1/4 minute resolution, but does the control software for the line run to higher resolution, such as down to the second? |
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Post by Deleted on Aug 16, 2012 22:05:18 GMT
I think you are right with Vic NB.
It can work down to the second, but I would think they have it set to multiples of 15s at the moment.
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Post by superteacher on Aug 16, 2012 22:49:24 GMT
I think you are right with Vic NB. It can work down to the second, but I would think they have it set to multiples of 15s at the moment. Have the modifications to sensitive edge / obstruction detection been completed yet, as both of these have the potential to destroy a 33tph service! |
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Post by seaeagle on Aug 17, 2012 18:02:18 GMT
I think you are right with Vic NB. It can work down to the second, but I would think they have it set to multiples of 15s at the moment. Have the modifications to sensitive edge / obstruction detection been completed yet, as both of these have the potential to destroy a 33tph service! The mods were finished before the olympics started. |
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Post by plasmid on Aug 23, 2012 0:17:51 GMT
Have the modifications to sensitive edge / obstruction detection been completed yet, as both of these have the potential to destroy a 33tph service! The mods were finished before the olympics started. Thought so, I can't recall the last time I saw a faulty train on the TFL website for the Victoria line. |
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Post by Deleted on Aug 24, 2012 22:30:21 GMT
Thought so, I can't recall the last time I saw a faulty train on the TFL website for the Victoria line. They weren't faulty for sensitive edges lol |
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