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Post by goldenarrow on Nov 14, 2019 22:39:27 GMT
Always wanted to ask about this, especially now that we are nearing the point of having the entire fleet making regular use of them in passenger service.
How is the tripcock latch on the S stock powered? And are there any aspects of it that make it vulnerable to frequent use like we are seeing mid-migration?
Thanks in advance, G.Arrow
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Colin
Advisor
My preserved fire engine!
Posts: 11,309
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Post by Colin on Nov 15, 2019 11:04:00 GMT
The full title is Tripcock Latch Relay - that last word is a bit of a clue....
I don’t know the full technicalities but it’s basically a relay that prevents Tripcock Mode being available and bypasses the time delay after tripping.
It dosen't have any direct effect on the Tripcock itself.
So when we arrive at a migration entry point, we switch the Master Control Switch to ATO (Automatic) or PM (Protected Manual) and the relay is supposed to switch over and take away TM (Tripcock Mode). As I said above, it also removes the time delay after tripping - so a train can still be physically tripped in the CBTC area but after resetting we can resume straight away in full speed using either ATO or PM.
When we arrive at a migration exit point we move the Master Control Switch back to TM and the relay should operate taking away all the CBTC stuff.
If the relay fails to switch as required a train maintainer can attempt to force it by plugging a box of tricks in.
That’s about as much as I understand of it.
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rincew1nd
Administrator
Junior Under-wizzard of quiz
Posts: 10,222
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Post by rincew1nd on Nov 15, 2019 18:49:21 GMT
So in CBTC areas the tripcock arm is still extended and the train could potentially be tripped on (eg) a dead fox?
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Post by Dstock7080 on Nov 15, 2019 19:15:14 GMT
So in CBTC areas the tripcock arm is still extended and the train could potentially be tripped on (eg) a dead fox? Yes exactly.
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Nov 15, 2019 19:59:20 GMT
When all areas are CBTC they should be removed altogether but this unlikely to happen for a few years yet
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