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Post by jamesb on Apr 13, 2007 19:35:26 GMT
I noticed today at Euston Square that as the train toward Baker Street entered the station, a bluish purple light came on on the tunnel wall at the end of the platform above the signal. I noticed a similar light at Canning Town on the Jubilee Line - can anybody explain what it is?
(I tried to search to see if the question had been answered before and couldn't find anything...)
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Deleted
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Post by Deleted on Apr 13, 2007 19:42:29 GMT
The blue platform end lights on the JLE are to confirm that the PEDs are closed.
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Post by Deleted on Apr 13, 2007 20:04:28 GMT
Could be the Tripcock Tester.
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Post by Deleted on Apr 13, 2007 20:13:01 GMT
Could be the Tripcock Tester. It undoubtedly is - blue and purple are common colours for tripcock tester lamps. I'm not sure why there would be one at Euston Square, of all places. |
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Post by Deleted on Apr 13, 2007 20:45:54 GMT
Eastbound - platform is on a descending slope, so that may have summat to do with it. Readily visible on the V125 Met Main DVD, camera cuts off just a snip before passing the Tripcock, the signal was against the train, IIRC...
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Tom
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Post by Tom on Apr 13, 2007 20:52:21 GMT
Could be the Tripcock Tester. I'm not sure why there would be one at Euston Square, of all places. The ones at Royal Oak and Edgware Road are only temporary ones which are switched in as required - this is the only permanent one on the H&C (that I can remember, anyway). |
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Post by jamesb on Apr 13, 2007 20:53:32 GMT
The blue platform end lights on the JLE are to confirm that the PEDs are closed. no, it's not those ones... because Canning Town is above ground so there are no PEDs... It's a circular lamp that comes on as the train is approaching the stop mark but then goes off again. |
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Deleted
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Post by Deleted on Apr 13, 2007 20:58:04 GMT
That is also a tripcock tester - if you look along the near side of the track, next to the platform lip, you can see the tester.
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Post by Deleted on Apr 13, 2007 21:08:11 GMT
its like a ramp and there is usually a clanking noise as a train passes over it... one end has like prongs; the tripcock passes between those prongs.
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Post by Deleted on Apr 14, 2007 2:02:31 GMT
its not blue its lunar white you have them where trains can enter service from sidings/depots and sometimes reversing points
when the platform track goes down this lights the light when the tripcock on the train rides over the ramp of the tester it pushes it down making a microswitch which puts the light out if the train failed the tripcock tester one the driver should notice but if he/she didnt then a warning alarm/bell in the signal cabin/control room operating the site would sound thus informing the signal operator/controller
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Post by frankoids on Apr 14, 2007 8:06:21 GMT
Isn't it if the light stays on you've failed the tripcock test???
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Post by jamesb on Apr 14, 2007 8:32:58 GMT
Isn't it if the light stays on you've failed the tripcock test??? I think thats what aetearlscourt is saying (the driver should notice [that the light has remained on...]) Fig. three on this website show's one: www.trainweb.org/tubeprune/Signalling%20photos.htmBut Tubeprune says that the light can be 'white, blue or purple, depending on location'. |
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Deleted
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Post by Deleted on Apr 14, 2007 9:31:25 GMT
Indeed. Barons Court e/b is actually one of the few places I've seen a lunar white tester lamp; most of the others are blue or purple.
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Post by jamesb on Apr 14, 2007 10:27:03 GMT
When there was a problem with brakes on the Northern Line back in October 2005 is it through a Tripcock Tester(s) that the problem was discovered?
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Post by Deleted on Apr 14, 2007 10:33:24 GMT
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Post by version3point1 on Apr 14, 2007 16:28:29 GMT
East Ham WB has a lunar white tester lamp. You'd never believe it though - looks like its never been given quick wipe with a damp cloth.  |
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Post by citysig on Apr 14, 2007 19:29:58 GMT
I'm not sure why there would be one at Euston Square, of all places. Perfect location. Pick a station, roughly halfway between Hammersmith and Barking as far as the H&C is concerned. Make sure it's a fairly simple location so you only need one tester each side (no multiple platforms). Choose somewhere without items a driver needs to pay extra attention to (draw-up signals etc.) and somewhere that is relatively straight. Bingo. I believe a large majority of C-stock operators also carry out their test of Westinghouse there as well. |
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solidbond
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Post by solidbond on Apr 14, 2007 23:56:30 GMT
I believe a large majority of C-stock operators also carry out their test of Westinghouse there as well. Indeed Euston Square is the official place for testing the Westinghouse on the Circle Line. It is usually the last stop before the terminus, but since the Circle doesn't shouldn't have a terminus, Euston Square is it's test location. It used to be tested at King's Cross, but, after the installation of the ticket gates, the GSM complained that the extra brake dust was affecting the barriers, so the C&H Health & Safety reps, of which I was one, were asked if we were happy to change the location to Euston Square. Since the approaches to Euston Square are much more straight forward (ie no speed restrictions on approach), we readily agreed  |
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