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Post by vic09 on Apr 14, 2012 16:59:57 GMT
Is it possible for an ATO train to underrun a platform  I mean any system TBTC, etc etc. If so how could it be corrected by the train operator? |
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Tom
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Post by Tom on Apr 14, 2012 17:36:19 GMT
Yes, it is possible and does on occasion happen. The train operator normally corrects it by manually driving up to the stop mark.
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Post by jardine01 on Apr 14, 2012 18:38:06 GMT
I have never seen a train underun yet! However i have seen a slight overrun on the Jubilee line before in both TBTC and previous manual driving. However though i have seen trains on the jubilee line which were nowhere near the stopping mark.
I belive the central line sometimes does this aswell maybe it depends on how fast a train comes into a platform?
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Post by bruce on Apr 14, 2012 19:41:27 GMT
'67 stock trains used to occasionally under-run on the Victoria Line, it was normally due to a train fault not a failure of a braking spot. As already pointed out, the Train Operator intervened and brought the train to a stop at the stopping mark.
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Deleted
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Post by Deleted on Apr 14, 2012 20:17:09 GMT
On the Vic's old 67's, you sometimes saw the driver quickly move the selector key on the dashboard from Auto to Manual, and carefully ease the train along the last couple of metres to the stopping mark, in the event of the train stopping short. On an overrun, all he has to do is simply touch either the red handle on the offside of the cab, or simply ease the Traction and Braking controller into a braking position to shut off the auto and halt the train.
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Deleted
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Post by Deleted on Apr 14, 2012 23:02:20 GMT
Yes, they can and every system I have been involved with has done it. As Tom says, normal process is the driver selects a manual driving mode and does the rest. What varies is the process / procedures for doing this which can be different depending on the system and railway. What i mean by that is a driver on a certain railway with a particular system would be able to 'just get on with it' and the average person would not even know it has happened, where as on another system / railway there could be a delay of a few minutes following procedures etc. I think the suppliers quote a figure for the expected achievement of a system to stop the trains precisely in stations, and I dont think any of them would quote a 100% guarentee on this ?
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Deleted
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Post by Deleted on Apr 15, 2012 8:47:29 GMT
Underruns in ATO happen all the time on the Central, it's overruns that are extremely rare. Rain seems to be a common factor but I've had them in tunnel sections and in blazing sunshine.
The normal procedure is to knock it into Coded Manual though if it happens within the platfrom limits you have to check that it's not down to a platfrom emergency plunger being operated and if it's in a controlled area you ask the signal desk if you are clear to proceed.
The selector switch on 92s is on the panel on the other side of the J door so unless you have a long reach you have to get up from the seat to move it from Auto into manual. Some TOps have perfected the practice of switching into manual with one hand while simultaneously knocking out the TBC with the other to get forward movement without triggering the emergency brake.
Sadly I do not possess this particular super power……
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Post by jardine01 on Apr 15, 2012 13:55:30 GMT
Like I have said before really I don't know if this is true, but it think it depends on how fast a train comes into a platform. For example on the Open Sections of the Jubilee when it crawls into the platforms at walking speed. I find it tends to undershoot slightly I am not sure for the reason for this?
I guess it may have something to do with braking? I remember overruns with the 1967 stock.
However stopping should be accurate all the time however the 2009 stock seems to be the best for stopping at the mark.
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I mean any system TBTC, etc etc. If so how could it be corrected by the train operator?
