a60
I will make the 8100 Class DART my new A Stock.
Posts: 745
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Post by a60 on Jan 20, 2011 22:56:50 GMT
5006 & 5197 have both fallen victim to this. What causes this?
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metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,421
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Post by metman on Jan 20, 2011 23:40:02 GMT
I would suggest old and degredating (is that a word?) wiring. Historically, the same has happened with the R stock and the Standard tube stock (with servere consequencies). The only solution is to rewire which is not worth it considering the programme.  |
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Deleted
Deleted Member
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Post by Deleted on Jan 21, 2011 0:27:50 GMT
How did it get to Northwood?
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Post by deadmans on Jan 21, 2011 6:14:53 GMT
How did it get to Northwood? the effected motor car could be isolated , for example by strapping the shoes up, away from the live rail. |
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Post by citysig on Jan 21, 2011 10:32:42 GMT
Which is how it got back from Aldgate last week.
To be honest, I don't think the train's wiring on it's own did the damage. There were other (traction current) factors on the railway that evening.
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Post by redsetter on Jan 21, 2011 12:48:32 GMT
forgive my lack of knowledge but would there be some sort of fuse protection and what are the measures in place that would stop this with the new stock?.
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roythebus
Pleased to say the restoration of BEA coach MLL738 is as complete as it can be, now restoring MLL721
Posts: 1,275
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Post by roythebus on Jan 21, 2011 13:01:38 GMT
You'll never stop wiring faults occurring. No amount of fuses will stop it either. There are fuses on each collector shoe which will only blow on a short circuit, not an overload, 2 different things!
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SE13
In memoriam
RIP 23-Oct-2013
Glorious Gooner
Posts: 9,737
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Post by SE13 on Jan 21, 2011 15:13:11 GMT
Which is how it got back from Aldgate last week. To be honest, I don't think the train's wiring on it's own did the damage. There were other (traction current) factors on the railway that evening. That's a new one.... Wrong sort of electricity on the line ;D ;D ;D Ok, I know where I left my coat!  |
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Post by citysig on Jan 22, 2011 11:37:51 GMT
Yes. Very good.  ;D ;D Put simply, the train had a fault which was causing an earth on the negative side, whilst it had also recently travelled through an area where there was an intermittent earth fault on the positive side. At the time of the train passing that area, neither the negative nor positive faults were showing as registering. However, it is believed that for a brief moment both did occur, and the resulting damage "simmered" until it's arrival at Aldgate - when smoke started to emit from under the car. |
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Ben
fotopic... whats that?
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Post by Ben on Jan 22, 2011 13:18:01 GMT
Just out of interest, would the same fault have had a more profound impact on a train with computerised control?
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Post by citysig on Jan 22, 2011 14:47:37 GMT
Difficult to say really. The result could be the same, or more or less. The fault and the way in which is was caused in this instance is a pretty small chance thing. A set of circumstances which just by chance all came together. If you tried to set up a repeat performance then maybe the train wouldn't get as far as Baker Street, or maybe it would be completely unaffected.
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Post by setttt on Jan 23, 2011 21:35:19 GMT
Certainly the S Stock is equipped to protect itself from a multitude of traction current "issues" such as earth faults.
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;D ;D
