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Post by uzairjubilee on Dec 23, 2009 13:23:09 GMT
Hi all. Why was there a train in the EB platform at Northfields yesterday which has some doors opened and some closed. I know it's not a great description but the 1973 ts have double leaf doors right? Well, some of those doors were open and the others closed. It was on the outer platform. Thanks. PS - I know its a really bad description     |
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Post by carlovel1 on Dec 23, 2009 13:35:53 GMT
Selective Door opening
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Chris M
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Post by Chris M on Dec 23, 2009 13:55:13 GMT
I think the OP is trying to say that in some cases one leaf of double leaf doors was open while the corresponding leaf was closed. I'm not aware that, selective door opening (or butterfuly cocks or porter buttons for that matter) can open or close single leaves in this manner?
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Post by plasmid on Dec 23, 2009 14:00:26 GMT
Not sure on the 73ts but on the 92ts you can open just the double doors and leave the single leaf doors shut. Happened whilst I was on a train once at Stratford.
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hobbayne
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Post by hobbayne on Dec 23, 2009 14:36:31 GMT
Give that man a cigar!! ;D |
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Post by Chris M on Dec 23, 2009 15:14:45 GMT
Give that man a cigar!! ;D He'd better not smoke it on the Underground though  |
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Post by Deleted on Dec 23, 2009 16:06:46 GMT
I've seen this happen a few times too, don't know what it's about. Probably a fault of some sort, always seems to rectify itself after a few goes at opening and closing  |
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Post by District Dave on Dec 23, 2009 16:49:28 GMT
I think to be more precise on a 73TS it is Selective Close - similar to what is fitted to the D Stock.
As the train was (by your description) a Northfields reverser I suspect the situation was as follows:
It is generally used at terminii so that as much heat is kept in the cars as possible when the weather is as it is at the moment and when the train is waiting its booked departure time - on occasions some drivers will use it at open section stations where they are aware that they will be held longer than normal.
On the D Stock using Selective Close closes all the doors on the train except for one door on each car. I'm not sure what proportion of the doors on a 73TS remain open.
Hope that helps.
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Post by tubeprune on Dec 23, 2009 19:56:14 GMT
The 73TS has a door system where one leaf at one doorway is connected mechanically to the door leaf in the next doorway through one door engine between them. This means that selective close will have some double doorways with one leaf open and one leaf closed. This is the only stock with this as far as I know. Other stocks have a door engine for each leaf.
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Post by carlovel1 on Dec 23, 2009 22:26:22 GMT
Give that man a cigar!! ;D I don't smoke!  ;D |
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Post by railtechnician on Dec 26, 2009 13:01:53 GMT
I think to be more precise on a 73TS it is Selective Close - similar to what is fitted to the D Stock. As the train was (by your description) a Northfields reverser I suspect the situation was as follows: It is generally used at terminii so that as much heat is kept in the cars as possible when the weather is as it is at the moment and when the train is waiting its booked departure time - on occasions some drivers will use it at open section stations where they are aware that they will be held longer than normal. On the D Stock using Selective Close closes all the doors on the train except for one door on each car. I'm not sure what proportion of the doors on a 73TS remain open. Hope that helps. Yep spot on! When I was working on stage one of the east end resignalling at Cockfosters in 1978 the 73 stock were just coming on stream in numbers. My recollection is that we had a bad winter and snow from Christmas to April. Waiting in a 73 stock for it to depart on our way back to Whitechapel depot was luxury in the chill wind compared to the 59, or was it 62, stock running predominantly on the line at the time. Selective door close made a big difference. |
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metman
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Post by metman on Dec 26, 2009 13:46:43 GMT
It was 1959ts on the Picc (bar a couple of 62s), they then went to the Northern, then some to the Bakerloo, and then the Northern again!
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Oracle
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Post by Oracle on Dec 26, 2009 15:24:37 GMT
The 1962 Stock trains were in theory for the Aldwych branch but did work with 1959 Stock on the 'main' rarely. In addition there was of course the three trains of 1956 Stock.
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metman
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Post by metman on Dec 26, 2009 15:33:46 GMT
Yes, there was a 3 car 62 built specially for the Aldwych branch. A couple of 35ts trains were also used for the Aldwych service too. For a time a couple of 62ts ran on the picc with one of the NDM removed and stored. They returned to the Central when the 1973 stock took over the line. I believe the 3 car 1962 train left the Aldwych service quite late on, couldn't give a date, someone no doubt can though. |
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Post by norbitonflyer on Dec 26, 2009 15:47:40 GMT
The 73TS has a door system where one leaf at one doorway is connected mechanically to the door leaf in the next doorway through one door engine between them. This means that selective close will have some double doorways with one leaf open and one leaf closed. This is the only stock with this as far as I know. Other stocks have a door engine for each leaf. I remember from my student days in the late '70s travelling to my digs at Turnham Green on late-night Piccadilly trains, that this facility being used while waiting for time at Hammersmith. SDO kept open one signle door and the adjacent leaf of the next double door. On more than one occasion I saw passengers trying to "free" the open leaf of the half-closed pair. No subsequent had this feature - the next two stocks (D78 and 1983) had single leaf doors, and subsequent builds (from 1986) have all had outside-hung doors which required a complete re-design of the mechanisms. |
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