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Post by jamesb on Nov 13, 2011 23:15:34 GMT
I passed a train that was stuck outside on the westbound approach to Leytonstone from Snaresbrook yesterday.
I was going eastbound.
The train was continuously hissing very loudly from one of the cars.
I overheard the line controller announcing (why do those announcements come through the first speaker in the passenger section of the leading car?) that the train was defective because of a 'burst air line' or something like that.
I think there was a train maintainer walking to the train from Leytonstone.
What is a burst air pipe? What would cause one to suddenly burst?
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Deleted
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Post by Deleted on Nov 13, 2011 23:33:11 GMT
I dont think the announcements come through the carriage PA speakers but maybe you can hear them through the cab wall?
Based on my patchy train knowledge, by the sounds of things thats definitely a burst. Also based on my patchy knowledge I think a burst pipe is where their is a burst in the train air supply pipe and it is leaking out causing the train to fail.
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Post by tubeprune on Nov 14, 2011 7:40:25 GMT
Main Line burst. 14:01. 18 minutes allocated.
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Post by dagdave on Nov 14, 2011 15:46:23 GMT
info for jamesb: The Main Line comprises compressors, reservoirs, pipes and hoses controlled by a governor. The air is used for the Train Line (brakes), door engines and traction control. The system can cope with a small leak by the compessors working harder. A large leak (burst) means the air is escaping faster than it can be replaced so the affected part of the system would need to be isololated and the train withdrawn from service for repair.
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Post by tecchy on Nov 14, 2011 16:29:39 GMT
This is burst season as well. Basically there is an auto-drain on the tanks of most stocks which as the compressor takes in air it also takes in moisture. The auto drain is supposed to get rid of the water sitting at the bottom of the tanks - they don't always work... The moisture collects and fills the tank up with water. The water/ moisture travels through the pipes and sit in the inter car hoses where subject to the cold it freezes and bursts the pipe.
Also as stated above any small leaks, the water freezes and makes the leak worse - hence a burst.
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Deleted
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Post by Deleted on Nov 14, 2011 16:53:29 GMT
There is also the issue of perished rubber. Trains are 20 years old now, so probably around the time for their second round of rubber hose replacements (rubber products typically guaranteed for around 10 years).
There is also the possibility that debris (lost shoegear, ballast etc) can cause damage to the copper pipework, causing a burst.
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Post by alfie on Nov 14, 2011 16:55:00 GMT
I was on the train behind that stuck at South Woodford. Most annoying bitch moaning about how terrible it is and why can't we shunt it out and how the driver wasn't telling us anything (when in fact he made very regular PA's)
According to the driver, it eventually managed to crawl into Leytonstone.
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