Deleted
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Post by Deleted on Jan 4, 2013 15:03:27 GMT
A few times now lately a train has departed from a station and it jolts as if it looses the pilot light. However the train carries on with the motors seeming to accelerate very slowly, however the train eventually does get up to full speed. What's all this about?
Secondly, the train I was on started in ATO and then I heard the TBC taken out of stow and the emergency brake alarm after a about two metres. However the train then restarted in ATO. I thought once the emergency brake was applied the train had to be driven manually to the next station to pickup ATO data again? Or is it just that the train was still in the PAC loop?
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Post by Deleted on Jan 4, 2013 15:04:35 GMT
One last thing, why is it that very often the DTS screen is full of flashing messages when I glance through the drivers door? I thought only errors appeared on here, if so why are there so many appearing?
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Post by superteacher on Jan 4, 2013 18:40:40 GMT
The jolting is usually down to passengers leaning.on the doors which causes them to open very slightly. As a result of this, the pilot light is lost, thus causing the motors to cut out, hence the jolt.
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Colin
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Post by Colin on Jan 5, 2013 17:09:58 GMT
A few times now lately a train has departed from a station and it jolts as if it looses the pilot light. However the train carries on with the motors seeming to accelerate very slowly, however the train eventually does get up to full speed. What's all this about? Could also possibly be just a gap in the traction current rails - you won't get full motors if pick up shoes are off traction current, and with rail gaps the motors may well not respond too well to coming off traction current then going back on. Sometimes in this scenario the overloads may trip out and thus you'll lose motors till you reset and re-motor. I don't know what the motor set up is on 92ts, but it'll either be something like that or the loss of doors closed visual (pilot light) as already mentioned. Secondly, the train I was on started in ATO and then I heard the TBC taken out of stow and the emergency brake alarm after a about two metres. However the train then restarted in ATO. I thought once the emergency brake was applied the train had to be driven manually to the next station to pickup ATO data again? Or is it just that the train was still in the PAC loop? How do you know that the CTBC came out of stow? Was you in the cab? Assumption is the mother of all f*%# ups!! |
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Fahad
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Post by Fahad on Jan 5, 2013 23:23:04 GMT
I thought that the repeated ker-chunk noise coming from the cab of an accelerating/braking 92TS train was that of relays being toggled (audible in ATO)? I doubt that the CTBC is as loud as that
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Colin
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Post by Colin on Jan 6, 2013 12:12:56 GMT
Absolutely.
I'm no expert on 92ts but I do know the noises of the various relays doing their stuff mean it's unlikely you'd be able to guess whether or not the CTBC has been knocked out of its stow position.
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Deleted
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Post by Deleted on Jan 6, 2013 13:33:49 GMT
On a related point - Isn't it an integral design feature of the Central Line trains, when the CTBC lever is removed from its stow position, it tells the ATO system to drop out, allowing the driver to safely take manual control in the event of a platform overrun or underrun etc, or even if trespassers are found on the line??
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Fahad
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Post by Fahad on Jan 6, 2013 15:49:32 GMT
On a related point - Isn't it an integral design feature of the Central Line trains, when the CTBC lever is removed from its stow position, it tells the ATO system to drop out, allowing the driver to safely take manual control in the event of a platform overrun or underrun etc, or even if trespassers are found on the line?? This will result in an emergency brake application - I think that the CTBC being in Stow completes the Round-Train Circuit when ATO is selected? |
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Deleted
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Post by Deleted on Jan 6, 2013 23:15:49 GMT
Could also possibly be just a gap in the traction current rails - you won't get full motors if pick up shoes are off traction current, and with rail gaps the motors may well not respond too well to coming off traction current then going back on. Sometimes in this scenario the overloads may trip out and thus you'll lose motors till you reset and re-motor. That sounds more likely as the motors still seemed to be accelerating in my carriage just very slowly and there was a rail gap involved. Well no, I heard the alarm that plays when the emergency brake is activated. To confirm there is an alarm for this isn't there? And then there was a bang which did sound like ac ctbc being put into stow from my one experience in a central line cab. Anyway the way the eb was applied perhaps through the plungers or an ATO fault I can't confirm. But I'm curious to know how the train restarted in ATO after, I thought once the train was halted it had to be driven manually to the next pac loop? Can anyone shed any light? |
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Post by plasmid on Jan 10, 2013 1:09:43 GMT
Yup, they now seem to accelerate slowly up to speed now when the train jolts.
One driver said the jolting was because the train behind was hoovering up all the power which I doubt was the case but plausible.
Also some drivers as of late appear to be driving manually all the way up to Liverpool Street in the morning. I'm not bothered by this but if you've travelled on the Central Line for years in ATO it's easy to know when the train is likely to brake or turn a corner or even brake in advance due to traffic, it's predictable.
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