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36tph
Sept 14, 2015 11:25:39 GMT
Post by stephenk on Sept 14, 2015 11:25:39 GMT
Hi,
Does anyone know if there will be any improvements to signalling to further shorten the RORI/platform-occupation times on the Victoria Line to allow for 36tph?
Aside from Walthamstow crossover, will be there be any other infrastructure or signalling improvements to allow for 36tph?
Thanks.
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36tph
Sept 14, 2015 17:44:45 GMT
Post by bromfir on Sept 14, 2015 17:44:45 GMT
Extra track circuits are needed for shortter headways and early backlock releases will also be needed
Also the extra trains data needs updating ie mapping etc
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36tph
Sept 14, 2015 18:46:15 GMT
Post by londonstuff on Sept 14, 2015 18:46:15 GMT
Thanks for this. Could you explain (or Seaeagle perhaps), what backlock releases are?
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36tph
Sept 14, 2015 20:34:59 GMT
Post by jimini on Sept 14, 2015 20:34:59 GMT
Novice question here, but the RORI acronym - why isn't it RIRO? I would have thought that roll in roll out would be a measure of station occupancy dwell time, rather than the former. TIA all!
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tut
Global Moderator
Posts: 2,158
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36tph
Sept 14, 2015 23:35:24 GMT
Post by tut on Sept 14, 2015 23:35:24 GMT
Thanks for this. Could you explain (or Seaeagle perhaps), what backlock releases are?
In the old-old days, backlocking was a means of preventing certain points or signal levers being moved when a train was travelling over a crossover, preventing the points from moving under the train. Backlock release refers to the release of this to enable the points to be moved, e.g. for an incoming train after a departing train has left. Obviously, you desire a means of safely and reliably determining the precise moment when a train is completely clear of a crossover, enabling the points to be moved as soon as possible, enabling (in our case) an incoming train to be cleared into a platform as soon as possible. Old threadLURS articleNowadays, its obviously the same idea, but there aren't any proper, old-school signal levers on the Vic that I'm aware of. |
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tut
Global Moderator
Posts: 2,158
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36tph
Sept 15, 2015 1:03:17 GMT
Post by tut on Sept 15, 2015 1:03:17 GMT
On a separate note, does the Vic still use track circuits as part of its day-to-day signalling system?
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Post by stephenk on Sept 15, 2015 10:46:10 GMT
Novice question here, but the RORI acronym - why isn't it RIRO? I would have thought that roll in roll out would be a measure of station occupancy dwell time, rather than the former. TIA all! The platform re-occupation time is the time taken for a train to depart (run out) and then the next train to arrive (run in) - this RORI instead of RIRO. Realistic capacity through a station is RORI + dwell time + operating margin. Extra track circuits are needed for shortter headways and early backlock releases will also be needed Also the extra trains data needs updating ie mapping etc Thanks for the information. I'd be interested to know what the new RORI/platform re-occupation times are expected to be? Is it theoretically possible for a crossover to be 'cleared' before a train has cleared the whole scissors crossover? E.g. if a train is leaving p1 at Brixton, and has cleared the fouling point of the facing crossover, then the route can be changed for the arriving train (instead of waiting until the departing train has cleared the whole scissors crossover). |
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rincew1nd
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Junior Under-wizzard of quiz
Posts: 7,118
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36tph
Sept 15, 2015 11:46:26 GMT
via mobile
jimini likes this
Post by rincew1nd on Sept 15, 2015 11:46:26 GMT
Novice question here, but the RORI acronym - why isn't it RIRO? I would have thought that roll in roll out would be a measure of station occupancy dwell time, rather than the former. TIA all! RIRO is dwell time - a measure of the efficiency of the station stop. RORI is the gap between the trains - a measure of the efficiency of the signalling and/or trains. Both measures contribute to the overall capacity of the line; more frequent trains mean fewer people per train, which means shorter dwell times, which mean trains can be more frequent. Unfortunately it's not quite that simple, but that's the gist of it! |
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36tph
Sept 15, 2015 14:41:03 GMT
Post by seaeagle on Sept 15, 2015 14:41:03 GMT
Both measures contribute to the overall capacity of the line; more frequent trains mean fewer people per train, which means shorter dwell times, which mean trains can be more frequent. Unfortunately it's not quite that simple, but that's the gist of it! You make it sound so simple, can you wave your magic wand now to put it into practice! lol |
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Post by superteacher on Sept 15, 2015 19:45:38 GMT
Both measures contribute to the overall capacity of the line; more frequent trains mean fewer people per train, which means shorter dwell times, which mean trains can be more frequent. Unfortunately it's not quite that simple, but that's the gist of it! You make it sound so simple, can you wave your magic wand now to put it into practice! lol Imagine the frequency you could run without passengers getting in the way! |
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36tph
Sept 15, 2015 20:55:33 GMT
Post by DistrictSOM on Sept 15, 2015 20:55:33 GMT
On a separate note, does the Vic still use track circuits as part of its day-to-day signalling system? FS2550 JTC Track Circuits |
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rincew1nd
Administrator
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Post by rincew1nd on Sept 15, 2015 22:42:09 GMT
Imagine the frequency you could run without passengers getting in the way! A similar sentiment is often expressed at my work, we would run a seamless, efficient, service if it wasn't for patients! (Yes, that is my tongue firmly in my cheek) |
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Post by superteacher on Sept 16, 2015 18:08:18 GMT
Imagine the frequency you could run without passengers getting in the way! A similar sentiment is often expressed at my work, we would run a seamless, efficient, service if it wasn't for patients! (Yes, that is my tongue firmly in my cheek) I'd say the same for schools, although the adults usually are far more hassle than the children! |
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36tph
Apr 1, 2016 12:32:19 GMT
via mobile
Post by ashlar on Apr 1, 2016 12:32:19 GMT
So... the 36 tph to Walthamstow was supposed to start in April 2016.
It is now April 2016. Any news?
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36tph
Apr 1, 2016 14:13:30 GMT
Post by reganorak on Apr 1, 2016 14:13:30 GMT
Remains at 34tph from mid-May but end-to-end running. 90 mins per peak of 36tph in November 2016 - maybe.
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