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Post by roboverground on Dec 10, 2016 18:59:51 GMT
could anyone point me in the right direction for any images or link to images of a class 378 unit with the cab front end door open ?
I understand the class 313 - 315 ( & 507/508?) units had a unique ladder that clipped on the front step allowing easy access to detrain in tunnels or elsewhere - versus the more regular two part emergency ladders common in 'guards van' and emergency equipment cabinets on train. Thanks to anyone able to assist
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Post by domh245 on Dec 10, 2016 19:04:53 GMT
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Post by roboverground on Dec 10, 2016 19:17:33 GMT
Thanks for that- so similar to Jubilee line stock in design
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Deleted
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Post by Deleted on Dec 10, 2016 19:58:01 GMT
That design is also used on Hong Hong's MTR Metro trains - may have been brought over by MTR, when Laing and MTR were appointed to run the Overground in 2007.
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Post by dazz285 on Dec 10, 2016 21:06:11 GMT
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Post by Deleted on Dec 10, 2016 23:28:43 GMT
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Post by bassmike on Dec 11, 2016 12:32:20 GMT
Surely if this unit is running on 4 rail track the ladder plonks straight onto the neg:rail and balances on a point about 4/5 inches wide?
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Post by domh245 on Dec 11, 2016 13:13:10 GMT
Surely if this unit is running on 4 rail track the ladder plonks straight onto the neg:rail and balances on a point about 4/5 inches wide? I imagine that in those areas, they can evacuate through the side doors (as you might a normal train). The front evacuation door is required for the narrow single bore tunnels where you can't evacuate out of the side. |
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Chris M
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Post by Chris M on Dec 11, 2016 13:29:22 GMT
Surely if this unit is running on 4 rail track the ladder plonks straight onto the neg:rail and balances on a point about 4/5 inches wide? I suspect that it is designed that it doesn't contact fourth rail (i.e. it stops higher than it), and is entirely supported by the body of the train rather than the ground. |
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Post by bassmike on Dec 11, 2016 17:56:30 GMT
When it lowered in the video it app[eared to whack down heavily on the ground
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Post by crusty54 on Dec 11, 2016 19:53:24 GMT
When it lowered in the video it app[eared to whack down heavily on the ground filmed in a depot over a pit with a board across the gap. Less of a drop than out on the track. |
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Post by norbitonflyer on Dec 11, 2016 21:21:59 GMT
The board is flush with the running rails. Sleepers would be lower, but the negative rail would be higher.
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Post by crusty54 on Dec 11, 2016 21:46:56 GMT
The board is flush with the running rails. Sleepers would be lower, but the negative rail would be higher. if there was a negative rail. Not present for the 378. |
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Post by Deleted on Dec 11, 2016 21:53:24 GMT
The board is flush with the running rails. Sleepers would be lower, but the negative rail would be higher. if there was a negative rail. Not present for the 378. Except between Gunnersbury and Richmond where the fourth rail is in place (actually up towards South Acton Junction if we're going to be pedantic). |
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Post by domh245 on Dec 11, 2016 22:32:00 GMT
if there was a negative rail. Not present for the 378. Except between Gunnersbury and Richmond where the fourth rail is in place (actually up towards South Acton Junction if we're going to be pedantic). And from Queen's Park to Harrow and Wealdstone. |
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metman
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Post by metman on Dec 11, 2016 23:02:15 GMT
Much of the negi rail is still place north of Harrow some on chairs, some not.
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rincew1nd
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Post by rincew1nd on Dec 11, 2016 23:37:35 GMT
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Post by crusty54 on Dec 12, 2016 0:48:15 GMT
Much of the negi rail is still place north of Harrow some on chairs, some not. but the escape method is to be used in tunnel sections under driver supervision. |
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Post by bassmike on Dec 12, 2016 11:31:47 GMT
looks like i've started something!
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Post by tjw on Dec 12, 2016 20:36:18 GMT
Much of the negi rail is still place north of Harrow some on chairs, some not. I had heard that the Negative Rail was vital and that is why it has been left. The Hayes branch (SR) also had a stretch for the same reason. |
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rincew1nd
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Post by rincew1nd on Dec 12, 2016 21:06:09 GMT
Isn't it there to provide a return current path?
Anyway, we drift...
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Post by tjw on Dec 12, 2016 21:32:24 GMT
Yes!
I presume that the Driver will be operating the doors and he will have already called up to have the power turned off before use. Perhaps there is an interlock as well.
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Post by redbond on Dec 13, 2016 7:14:45 GMT
Let me just reiterate.
1. The stairs are fully supported by the train itself.
2. The stairs would only be used in a situation where there has already been an Emergency Switch Off of the current.
3. The stairs would only be used in locations where there isn't a fourth rail in the four-foot (Primarilay ELL Core Route).
4. The stairs are used as a last resort only and the door and stairs are a PITA to close back up again.
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