Oracle
In memoriam
RIP 2012
Writing is such sweet sorrow: like heck it is!
Posts: 3,234
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Post by Oracle on May 1, 2008 10:35:11 GMT
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Post by tubeprune on May 1, 2008 11:53:56 GMT
I'm getting an error message from this link. However, I do remember that the old arrangements involved a train length gap because of the buslines on Q Stock. After the Q Stock was withdrawn, they changed the arrangements. I do remember the Turnham Green - Gunnersbury interface had a contactor system. Now, where are my notes? *goes off to rummage....* |
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Colin
Advisor
My preserved fire engine!
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Post by Colin on May 1, 2008 12:26:53 GMT
Can't speak about past arrangements, but the situation today is that the rail gaps are 48' long on both roads. - The Westbound/Down road's gap starts 754' from the platform at @ Putney Bridge.
- The Eastbound/Down road's gap ends 107' before the platform @ Putney Bridge.
That information comes from the line controllers diagrams. |
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Ben
fotopic... whats that?
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Post by Ben on May 1, 2008 13:16:44 GMT
Was it common for a train to become gapped prior to 1971 then?
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Deleted
Deleted Member
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Post by Deleted on May 1, 2008 13:34:58 GMT
One of my GPO colleagues was a driver at PG, he once told me that it was a regular occurrence in older stock.
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Ben
fotopic... whats that?
Posts: 4,282
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Post by Ben on May 1, 2008 13:58:53 GMT
So if the Q stock train is eventually restored, presumably it will be banned from this section?
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Post by tubeprune on May 1, 2008 15:05:49 GMT
I doubt if they will couple the buslines. The train can work without them with simple modifications.
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Post by railtechnician on May 1, 2008 18:51:55 GMT
I doubt if they will couple the buslines. The train can work without them with simple modifications. What are the arrangements on 'modern' stock then? I have always thought of 'C' stock as two car units and other stocks as three or four car units as far as supplies derived from the 600v pickups are concerned but is this so? |
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solidbond
Staff Emeritus
'Give me 118 reasons for an Audible Warning on a C Stock'
Posts: 1,215
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Post by solidbond on May 1, 2008 19:05:54 GMT
I doubt if they will couple the buslines. The train can work without them with simple modifications. What are the arrangements on 'modern' stock then? I have always thought of 'C' stock as two car units and other stocks as three or four car units as far as supplies derived from the 600v pickups are concerned but is this so? Excepting the 92TS, which are a different kettle of fish altogether  , other stocks have current collector shoes on the motor cars only. Although they are 2/3/4 car units, the 630 Volts is not on a full busline, so the shoes on one motor car are not connected to the other motor cars. The 630V may be provided from one motor car to the other cars on that unit, for various circuits such as compressors or MAs, but the Traction Motors usually get their supplies from the shoes on their own car. On the 92TS, all cars have Traction Motors, but only the A & C (or D) cars have shoes. Thus the B cars Traction Motors will get their 630V from the other car of the two car unit  |
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Post by tubeprune on May 1, 2008 20:18:02 GMT
Just to follow up on the busline questions, a busline on a train connects all the shoes. This means that a train will bridge a gap in the current rails. If the supply arrangement is different (3-rail to 4-rail) as at Putney Bridge, it will mean the two supply networks become connected. The most common result was to blow the 630 volt fuses on the train - not helpful.
The COP Stock was the last to have a unit busline, i.e. the shoes on the front car were connected to the shoes on the rear car of the 2- or 3-car unit. Nowadays, all trains are designed so that shoes on one car are never connected to shoes on another.
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Colin
Advisor
My preserved fire engine!
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Post by Colin on May 2, 2008 0:57:38 GMT
Some bright spark somewhere has only just cottoned on that the shoes on a unit are not connected - so now we can motor over a current section rail gap where the juice is off in one section or another. Permission must be sought from the line controller before doing so though. Before anyone questions what I've said, I was told this during my recent annual rules refresher. I have looked in the rule books, but surprise surprise I can't find any reference to it  |
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Post by happybunny on May 2, 2008 3:53:39 GMT
I was told the rules had changed to the section that says "If you find a RGI illuminated but don't have time to stop before the RGI then you must coast until fully into the next section" TO "coast or motor into the next section"
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Post by chrish on May 2, 2008 11:11:21 GMT
I was told the rules had changed to the section that says "If you find a RGI illuminated but don't have time to stop before the RGI then you must coast until fully into the next section" TO "coast or motor into the next section" You are quite correct HB (as usual) Rule Book 7, section 6.1: If you cannot stop the train, you must motor or coast across the current rail gap (to the next station or as far as signalling permits) Personally, I would interpret this as motor completely over th gap to get up as much speed as possible in order to stand the best chance of reaching the next station. |
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Deleted
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Post by Deleted on May 2, 2008 23:42:58 GMT
Personally, I would interpret this as motor completely over th gap to get up as much speed as possible in order to stand the best chance of reaching the next station. I'm not sure I would want to build up too much speed, since other staff on the track may have mistakenly assumed that traction current off = no trains approaching! |
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Post by chrish on May 3, 2008 13:02:55 GMT
Personally, I would interpret this as motor completely over th gap to get up as much speed as possible in order to stand the best chance of reaching the next station. I'm not sure I would want to build up too much speed, since other staff on the track may have mistakenly assumed that traction current off = no trains approaching! Which is why I would pay attention to the other half of 7.6.1 about pop whistles around corners and approaching stations. I see your point though, and I suppose it would depend a lot also on where this is happening... if its downhill then you may not want to motor at all... On a slightly related noted.. did anyone else enjoy passing our RGI whilst illuminated today?! ;D  |
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Colin
Advisor
My preserved fire engine!
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Post by Colin on May 4, 2008 19:14:32 GMT
Can't comment on the RGI as I'm on a long weekend (  ;D ;D) - but in relation to passing an illuminated RGI where the current is off, all the points raised are valid and are connected to what I said earlier: Permission must be sought from the line controller before doing so |
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, other stocks have current collector shoes on the motor cars only. Although they are 2/3/4 car units, the 630 Volts is not on a full busline, so the shoes on one motor car are not connected to the other motor cars. The 630V may be provided from one motor car to the other cars on that unit, for various circuits such as compressors or MAs, but the Traction Motors usually get their supplies from the shoes on their own car.
