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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#21
December 20th 17, 05:45 PM
posted to uk.railway,uk.transport.london
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Overhead wire in moorgate line stations
On 19.12.17 19:54, Clive D.W. Feather wrote:
In article , writes Is there nothing that will force a pan drop? If it rises too high, it will drop automatically. I don't think there's any stock where the automatic power control magnets drop the pan - they just trip the main breaker instead. One Metro-North, for example, the M2 runs dual-mode DC on 3rd rail and AC under the wire. I assume that the same happens with the newer M8. As soon as that train's shoes come into contact with live 3rd rail, the pantographs automatically come down. What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. |
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#22
December 20th 17, 06:16 PM
posted to uk.transport.london
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Overhead wire in moorgate line stations
Why do these threads carry on for so long?
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#23
December 20th 17, 10:44 PM
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Overhead wire in moorgate line stations
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#24
December 21st 17, 12:24 AM
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Overhead wire in moorgate line stations
On 20.12.17 22:44, Clive D.W. Feather wrote:
In article , writes What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. So what do you do at the equivalent of Drayton Park, where the train comes to a stop on the 3rd rail but needs to start on the overhead because the third rail ends 5 metres beyond the front of the stopped train? I was speaking about M-2s, and not about 313s. I assumed, in the latter case, that there is a mode switch. |
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#25
December 21st 17, 03:07 AM
posted to uk.transport.london
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Overhead wire in moorgate line stations
On 2017\12\20 18:16, Offramp wrote:
Why do these threads carry on for so long? To stop the pan coming off the end? |
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#26
December 21st 17, 10:34 AM
posted to uk.railway,uk.transport.london
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Overhead wire in moorgate line stations
On Thu, 21 Dec 2017 00:24:04 +0000
" wrote: On 20.12.17 22:44, Clive D.W. Feather wrote: In article , writes What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. So what do you do at the equivalent of Drayton Park, where the train comes to a stop on the 3rd rail but needs to start on the overhead because the third rail ends 5 metres beyond the front of the stopped train? I was speaking about M-2s, and not about 313s. I assumed, in the latter case, that there is a mode switch. So you mean they won't go up automatically, not won't go up at all? Because if they won't go up at all when on 3rd rail you've got a problem, unless over there they have to coast off the 3rd rail then hope the pan works because if not then that'll be the whole line blocked with a dead train. |
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#28
December 21st 17, 11:45 PM
posted to uk.railway,uk.transport.london
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Overhead wire in moorgate line stations
On Thu, 21 Dec 2017 13:33:34 +0000, "
wrote: On 21.12.17 10:34, wrote: On Thu, 21 Dec 2017 00:24:04 +0000 " wrote: On 20.12.17 22:44, Clive D.W. Feather wrote: In article , writes What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. So what do you do at the equivalent of Drayton Park, where the train comes to a stop on the 3rd rail but needs to start on the overhead because the third rail ends 5 metres beyond the front of the stopped train? I was speaking about M-2s, and not about 313s. I assumed, in the latter case, that there is a mode switch. So you mean they won't go up automatically, not won't go up at all? Exactly. The driver (engineer) switches the power mode, then hits the "pan up" switch. Because if they won't go up at all when on 3rd rail you've got a problem, unless over there they have to coast off the 3rd rail They coast off the 3rd rail and then raise when completely under the wire and moving. It's done on the fly, AIUI, to help the train quickly assimilate the new power. Not done here where OHLE and 3rd rail overlap or share a section of track (Camden Bank). Changing on the move is a minority activity done by cl.378s (only ?). then hope the pan works because if not then that'll be the whole line blocked with a dead train. M2s and M8s are married pairs, coupled into a consist. Each of those pairs has a pantograph, and they all go up. Thus, if one of them does not work, the other ones will take over. |
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#29
December 22nd 17, 12:27 AM
posted to uk.railway,uk.transport.london
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Overhead wire in moorgate line stations
On 21.12.17 23:45, Charles Ellson wrote:
On Thu, 21 Dec 2017 13:33:34 +0000, " wrote: On 21.12.17 10:34, wrote: On Thu, 21 Dec 2017 00:24:04 +0000 " wrote: On 20.12.17 22:44, Clive D.W. Feather wrote: In article , writes What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. So what do you do at the equivalent of Drayton Park, where the train comes to a stop on the 3rd rail but needs to start on the overhead because the third rail ends 5 metres beyond the front of the stopped train? I was speaking about M-2s, and not about 313s. I assumed, in the latter case, that there is a mode switch. So you mean they won't go up automatically, not won't go up at all? Exactly. The driver (engineer) switches the power mode, then hits the "pan up" switch. Because if they won't go up at all when on 3rd rail you've got a problem, unless over there they have to coast off the 3rd rail They coast off the 3rd rail and then raise when completely under the wire and moving. It's done on the fly, AIUI, to help the train quickly assimilate the new power. Not done here where OHLE and 3rd rail overlap or share a section of track (Camden Bank). Yes, I have seen that plenty of times, such as at City Thameslink, Farringdon and Drayton Park. Changing on the move is a minority activity done by cl.378s (only ?). Class 373s also changed over on the fly when they ran out of Waterloo, IIRC. |
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#30
December 22nd 17, 12:33 AM
posted to uk.railway,uk.transport.london,nyc.transit
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Overhead wire in moorgate line stations
On 21.12.17 23:45, Charles Ellson wrote:
On Thu, 21 Dec 2017 13:33:34 +0000, " wrote: On 21.12.17 10:34, wrote: On Thu, 21 Dec 2017 00:24:04 +0000 " wrote: On 20.12.17 22:44, Clive D.W. Feather wrote: In article , writes What about in the reverse direction? You want the pan to come up while in the transition area. Nope, got to set the mode switch and manually raise them. Pans will also not go up if any part of the train is on contact with the 3rd rail. So what do you do at the equivalent of Drayton Park, where the train comes to a stop on the 3rd rail but needs to start on the overhead because the third rail ends 5 metres beyond the front of the stopped train? I was speaking about M-2s, and not about 313s. I assumed, in the latter case, that there is a mode switch. So you mean they won't go up automatically, not won't go up at all? Exactly. The driver (engineer) switches the power mode, then hits the "pan up" switch. Because if they won't go up at all when on 3rd rail you've got a problem, unless over there they have to coast off the 3rd rail They coast off the 3rd rail and then raise when completely under the wire and moving. It's done on the fly, AIUI, to help the train quickly assimilate the new power. Not done here where OHLE and 3rd rail overlap or share a section of track (Camden Bank). Changing on the move is a minority activity done by cl.378s (only ?). Changing over at V-Zero on an M-2 will mean a rough start, and is thus ill-advised. Are the M-2s still running, by the way? I know that the New Haven Line EMUs are now mainly M-8, though I was under the impression that Metro-North were keeping a few around for peak services. |
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