1992 Stock Stalling

150001 · 13 Aug 2013

Hi there; rode on the 1992 stock last Wednesday during the rush hour and it was packed full. I noticed that every time we started moving from a station, the power cut out and the train essentially stalled. This happened about 3-4 times as we left the station. There was no points or anything in the track so it wasn't the routine power cut out from gaps in the 4th rail. Me and my dad assumed that the problem was due to the sheer weight of the train; it was packed full so the motors may have been struggling to move everyone? Can anyone confirm this?

RailUK Forums

joeykins82 · 13 Aug 2013

It's the train's protection system kicking in because someone was leaning against the doors in such a way that they were being detected as open. All tube trains do this.

150001 · 13 Aug 2013

That would make sense; people were up against the doors. Seems a bit of stupid system really when that keeps happening.

starrymarkb · 13 Aug 2013

It's basically a protection to prevent the train moving with a door open. People push against doors hard enough that it pushes the contacts apart. Train thinks door open and cuts power to the motors

ert47 · 13 Aug 2013

I always thought that when the train is accelerating, anyone who is leaning against the door (- specifically any door that opens in the opposite direction to travel) will pull that door slightly open. The interlock kicks in, train stalls, person leaning against the door falls forward, door closes and interlock is disengaged - train accelerates. Please correct me if thats wrong.

Only notice it happening on the '92 stock - always found that the trains move off faster compared to stock on other lines.

joeykins82 · 13 Aug 2013

That's certainly the main cause. It definitely happens on all stock: the 2009 stock in particular was notorious for having to be taken out of service (and causing suspensions & major delays in the process) during the morning and evening peaks because the sensitive edge sensors were so sensitive and prone to failure. It's been fixed now and the Victoria line has been very reliable of late!

starrymarkb · 13 Aug 2013

ert47 said:
.

Only notice it happening on the '92 stock - always found that the trains move off faster compared to stock on other lines.

1992 stock was built for acceleration. Unlike other tube stock every axle is motored. It's the only tube stock that I need to hang on when standing

150001 · 13 Aug 2013

Thanks for the answers; I'll remember in the future myself not to lean on the doors!

anthony263 · 13 Aug 2013

starrymarkb said:
1992 stock was built for acceleration. Unlike other tube stock every axle is motored. It's the only tube stock that I need to hang on when standing

I have found that myself when traveling on the 1992 stock. That said they are fun.

As for the door interlocking system, the 2009 stock is the worst for this. In fact you have to watch at least 1 episode of the Tube when their were dicsussing the problems on the victoria and jubilee lines

150001 · 13 Aug 2013

Ironically enough just been watching the BBC The Tube series from last year and guess what, they are having issues with the Jubilee line!

causton · 13 Aug 2013

I have personally done this myself by falling against a door... guess which stock? yep, 92 stock, and I've had no problems on any others! Must be the high acceleration caused by every axle being motored as stated above and the automatic operation having three options: full power, full brake or coast!

Mojo · 13 Aug 2013

joeykins82 said:
That's certainly the main cause. It definitely happens on all stock

Whilst all stock prevents motoring when the doors open, in my experience it is only the 1992 stock which has this problem occurring regularly as it is the oldest stock in service to have externally hung doors, the doors on this stock are also lighter and come apart much easier; simply by someone leaning on them and the force of the train accelerating causing them to move to one side.

joeykins82 · 14 Aug 2013

As a frequent Piccadilly line traveller I can definitely state that it happens on the 1973 stock; it's more likely (as one would expect) during the morning peaks and late on Friday and Saturday when the worse for wear crowds from Soho and Covent Garden are leaning up against the doors!

WinterChief · 14 Aug 2013

This happens on all stocks (Except S Stock and 09 Stock as they have a different door mechanism)

People only notice it on the 92 Stock as the push back door springs are noticeably weaker than other stocks.

1992 Stock Stalling

150001

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