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Post by regp41 on Apr 30, 2016 12:42:12 GMT
Prompted by the unfortunate incident at Barking Station earlier this week, I was wondering how quickly or abruptly an Underground train would stop if this device is released.
Is it a sort of emergency brake or a more gradual deaccelleration?
Could someone perhaps explain what happens.
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Deleted
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Post by Deleted on Apr 30, 2016 12:46:18 GMT
It is an emergency brake so it would stop the train as soon as possible.
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Post by philthetube on May 1, 2016 9:34:53 GMT
As soon as possible is not very soon however. train wheels are metal, with no tread, as are the rails so their is not much grip to allow harsh braking
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Chris M
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Post by Chris M on May 1, 2016 10:15:07 GMT
As soon as possible is not very soon however. train wheels are metal, with no tread, as are the rails so their is not much grip to allow harsh braking Most modern trams, and I think some trains (although not LU stock to my knowledge), have powerful eletromagnets that engage with the track to increase the emergency braking rate. en.wikipedia.org/wiki/Track_brake#Electromagnetic_track_brakes
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Post by domh245 on May 1, 2016 10:33:05 GMT
As soon as possible is not very soon however. train wheels are metal, with no tread, as are the rails so their is not much grip to allow harsh braking It may not be as rapid as a road car, but it certainly does brake sharply enough to send you clattering into the person next to you. I've experienced a few emergency brake applications, a fair number of which were tripcock events, and you certainly don't want to be standing up when they occur (good practice dictates that the T/Op requests passengers sit down where possible). The 2009 stock has a specified emergency brake deceleration of 1.4m/s 2
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Post by Deleted on May 1, 2016 10:41:22 GMT
Is "Dead Man's Handle" an official term? I know it is longer but maybe "Incapacitation Protection Device" (IPD) might be more discreet and appropriate.
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Post by norbitonflyer on May 1, 2016 11:21:38 GMT
Is "Dead Man's Handle" an official term? I know it is longer but maybe "Incapacitation Protection Device" (IPD) might be more discreet and appropriate. Drivers safety Device (DSD) I think is the official term. Or Driver Vigilance Device if (s)he has to do something more than simply not let go
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Post by Dstock7080 on May 1, 2016 11:25:15 GMT
Is "Dead Man's Handle" an official term? I know it is longer but maybe "Incapacitation Protection Device" (IPD) might be more discreet and appropriate. S Stock:
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Post by crusty54 on May 1, 2016 17:31:27 GMT
The train at Barking also had a treadle which has to be depressed to keep the train moving.
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Post by philthetube on May 2, 2016 7:16:31 GMT
At 60mph an S8 will stop in around 2 train lengths, 16 cars, approx 300 yards.
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Post by philthetube on May 2, 2016 7:48:55 GMT
Is "Dead Man's Handle" an official term? I know it is longer but maybe "Incapacitation Protection Device" (IPD) might be more discreet and appropriate. S Stock: Dead mans handle seems to be used, (translated of course) in most European countries
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Post by philthetube on May 4, 2016 2:02:36 GMT
"The emergency brake was operated when the train was around 100 metres from the crossing, but even with full emergency brake applied, the train stopped 468 metres beyond the crossing after the collision with the tractor."
Taken from an RAIB report, The train was 2 dmu's coupled, (class 150)
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Post by brigham on May 4, 2016 9:04:38 GMT
Is "Dead Man's Handle" an official term? I know it is longer but maybe "Incapacitation Protection Device" (IPD) might be more discreet and appropriate. It doesn't convey the meaning with quite the same clarity though, does it?
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Post by Deleted on May 4, 2016 19:23:09 GMT
The Driver's Safety Device handle may be a good suggestion.
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Post by brigham on May 5, 2016 8:28:16 GMT
The Driver's Safety Device handle may be a good suggestion. It could make a major contribution to rail safety.
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Post by Jerome H on May 5, 2016 19:07:17 GMT
if the driver is incapacitated, it's really a passenger safety device at that point.
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roythebus
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Post by roythebus on May 6, 2016 23:48:32 GMT
It's always been the deadman's handle; in Germany "der todtmann". In recent years BR and LT called it the DSD. In BR terms, to "drop the handle" meant to go out on strike.
Fortunately it is rarely used for its intended purpose, the Barking incident being the most recent. Incidentally, several hundred railwaymen attended the late driver's funeral last week with over 600 messages of condolence on the Lost Boys internet forum .
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