gefw
Gone - but still interested
Posts: 201
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Post by gefw on Feb 15, 2024 22:23:10 GMT
As well as the trains having some issues, problems with the signalling system also appear to be taking shape... There was a signalling problem at Bank a few days ago, and today a signal failure at Leytonstone has ruined the service. In the same way that trains are 30 years old with obsolete and "aged" equipment, likewise for the signalling system. Like CLIP ( for the trains) there are 2 projects underway to ensure and improve Signalling reliability & maintainability (spares). I believe these are called "Signalling Life extension" and "Incremental upgrade". |
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Post by xtmw on Feb 19, 2024 20:36:27 GMT
Forgive me if this is silly but I was thinking about this on my journey home....
I think ATO might have something to do with this. It really does wear the trains out. It accelerates the train as much as it can, and brakes as hard as it can (except for the open areas), I also believe ATO shortens the life of stock?
I don't know about the Waterloo & City but I believe the trains aren't actually that bad when it comes to motor problems, neither are the 72 or 73 stock, which use DC motors. Unless there is some silent fleet related disruption happening on those? I think it's just funny how this is happening on a fleet which use DC motors where ATO is used 99% of the time.
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towerman
My status is now now widower
Posts: 2,968
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Post by towerman on Feb 19, 2024 22:10:14 GMT
Remember when 62TS reigned on Central Line,powers that be decided to put rewinding motors out to contract rather than use the winding shop at Acton.Lo and behold within 3 months we had a lot of motor flashovers.
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Post by ted672 on Feb 19, 2024 22:11:38 GMT
I think ATO might have something to do with this. It really does wear the trains out. It accelerates the train as much as it can, and brakes as hard as it can (except for the open areas), I also believe ATO shortens the life of stock? A friend of mine who works on the Central line mentioned that the "coast code(?)" had never been implemented, so the trains maintain speed only by accellerating and braking. This must put more strain on the mechanical elements compared to manually driven trains. |
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Post by xtmw on Feb 19, 2024 22:18:11 GMT
I think ATO might have something to do with this. It really does wear the trains out. It accelerates the train as much as it can, and brakes as hard as it can (except for the open areas), I also believe ATO shortens the life of stock? A friend of mine who works on the Central line mentioned that the "coast code(?)" had never been implemented I do recall reading about this - Wood Lane can set coasting vectors, so ATO has the capability to coast, it just never has been enabled. |
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towerman
My status is now now widower
Posts: 2,968
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Post by towerman on Feb 20, 2024 12:03:05 GMT
Used to have coasting spots under the old Victoria Line system,Finsbury Pk to Seven Sisters NB was virtually freewheeling all the way.Suppose with the increased services they’re not needed now.
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Post by xtmw on Feb 20, 2024 14:03:25 GMT
I wonder if it could be worth extending Coded Manual operation east of Leytonstone and west of White City during the week as well, or turning on the coasting vectors (if that's even possible?)
Or it might just be too late and the damage is done....
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gefw
Gone - but still interested
Posts: 201
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Post by gefw on Feb 20, 2024 15:39:28 GMT
I think ATO might have something to do with this. It really does wear the trains out. It accelerates the train as much as it can, and brakes as hard as it can (except for the open areas), I also believe ATO shortens the life of stock? I don't know about the Waterloo & City but I believe the trains aren't actually that bad when it comes to motor problems, neither are the 72 or 73 stock, which use DC motors. Unless there is some silent fleet related disruption happening on those? I think it's just funny how this is happening on a fleet which use DC motors where ATO is used 99% of the time. ATO does certainly drive the trains harder but the design & maintenance regime should have allowed for this - but that was the era of Value Engineering. Note the ATO does not Use Maximum service braking possible - It uses a reliably achievable rate (assuming various worst case scenarios such as loading and possibly even some cars motors being cut out) With regards to the other fleets with DC motors (Bak & Picc) I would suggest that a key issue is that they do not use regen braking (which has a major effect on the duty cycle of the motors/drive train + the associated variations in traction voltages) |
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Post by imran on Mar 21, 2024 17:59:22 GMT
Glad to hear this problem is being resolved slowly! It may be slowly but it’s better than nothing!
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