Deleted
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Post by Deleted on Aug 26, 2008 21:34:58 GMT
Are the tripcocks on the 'inner' cabs isolated when coupled up? EG when you have 2 double-ended A stocks the tripcocks on the 2 DMs at the centre of the formation?
EDIT: Slightly OT but while I'm on the subject of tripcocks:
Are the trainstops always located on the Outside of the RH rail, or do they crop up on the LH side aswell?
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Post by Deleted on Aug 26, 2008 21:40:22 GMT
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Colin
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Post by Colin on Aug 27, 2008 0:42:17 GMT
If the tripcocks in the middle of a train were not isolated, the train would be 'middle tripped'; so they are always cut out.
As for trackside trip arm locations; they are always on the right hand side in the direction of travel. Where a section of track has bi-directional signalling (ie, a wrong road starter, terminal platform, etc), the train stop that isn't relevant to the direction of travel (ie, on the left) will drop down so that the train isn't rear tripped.
Hope that makes sense?.......
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Post by railtechnician on Aug 27, 2008 9:58:11 GMT
If the tripcocks in the middle of a train were not isolated, the train would be 'middle tripped'; so they are always cut out. As for trackside trip arm locations; they are always on the right hand side in the direction of travel. Where a section of track has bi-directional signalling (ie, a wrong road starter, terminal platform, etc), the train stop that isn't relevant to the direction of travel (ie, on the left) will drop down so that the train isn't rear tripped. Hope that makes sense?....... Just to clarify that for anyone who doesn't quite understand it. When a train legitimately approaches a trainstop from the wrong direction a trainstop release circuit is set up by the selected opposing route and triggered on approach as the train drops onto its replacing track. Such trainstops are thus located adjacent to block joints to obviate the possibility of a rear trip. The replacing track in the normal direction of travel is the approach track in the wrong direction and were the trainstop located in rear of the replacing track blockjoint as normal the trainstop head would pop back up before the last set of wheels had passed it as the track that triggered the trainstop release picked up again. |
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Deleted
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Post by Deleted on Aug 27, 2008 10:02:34 GMT
Thanks all - Colin that's what I thought, but I wondered if the trains were clever and ignored a middle tripcock. Obviously they're not and they get isolated instead.
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Post by tubeprune on Aug 31, 2008 7:00:33 GMT
Thanks all - Colin that's what I thought, but I wondered if the trains were clever and ignored a middle tripcock. Obviously they're not and they get isolated instead. Middle tripcocks used to be automatically isolated when units were coupled and automatically reset when uncoupled. Has this facility been withdrawn? |
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towerman
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Post by towerman on Aug 31, 2008 13:58:46 GMT
All wedgelock coupler fitted stock up to 62TS automatically isolated the tripcocks when coupled.72TS onwards the TCIC's in the middle have to be cut out.
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Deleted
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Post by Deleted on Sept 6, 2008 12:44:28 GMT
Just to clarify that for anyone who doesn't quite understand it. When a train legitimately approaches a trainstop from the wrong direction a trainstop release circuit is set up by the selected opposing route and triggered on approach as the train drops onto its replacing track. Such trainstops are thus located adjacent to block joints to obviate the possibility of a rear trip. The replacing track in the normal direction of travel is the approach track in the wrong direction and were the trainstop located in rear of the replacing track blockjoint as normal the trainstop head would pop back up before the last set of wheels had passed it as the track that triggered the trainstop release picked up again.  Thanks for the explanation, RT.........................just going to go for a little lie down now  |
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Thanks for the explanation, RT.........................just going to go for a little lie down now 
