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Post by Deleted on Jan 3, 2013 12:57:16 GMT
I saw on the CULG website that the turntable was installed because carriages were the wrong way because of the loop by Embankment.
Why was that? Surely the trains would be coming back every second trip the correct way?
And anyway, since trains can be driven either way, why would it matter being the wrong way?
Also, today, with the loop by Kennington, why do they not have such problem?
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Post by Deleted on Jan 3, 2013 13:02:40 GMT
Because of the way the driving and braking controls were arranged, the "A" end of one car had to be coupled to the "D" end of another car. When the trains were being maintained at Golders Green, the cars were uncoupled and sometimes it was necessary to turn a car to make up a train.
The present trains on the Northern have couplings arranged so that cars can be joined at either end.
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Post by norbitonflyer on Jan 3, 2013 15:20:15 GMT
Most underground stock is "handed", which is not a problem on a simple shuttle servce - the most drastic examples were the original electrification systems on the Northern City Line and the CSLR - the former had a positive rail on one side and a neg on the other, the latter had the single current rail betwen the running rails, but off-centre to avoid being fouled by the couplings. Not a problem if the train can't turn round!
But when loops or triangles appeared on the SSL, Northern Central, and Piccadilly Lines it was possible for trains to be turned round in service. If it was necessary to reform a train (perhaps there were two half-trains in need of repair, and you want to make one good one out of what's left) it helps if you can couple them together. So many stocks are now ambidextrous - you can couple any unit to any other, either way round. I believe the A stock was the first, followed by C stock, 1972 stock (where the non-driving end of a 3-car can couple to either end of a double-cabbed 4-car) and 1992 stock. (Can two odd numbered 1995 stock (or S stock) half-trains couple together?)
1973 stock is handed, as the T4 loop was not planned until long after the stock was introduced.
I understand that one reason trains did not run right round he hainault loop until the 1992 stock appeared was to avoid 1962 stock rains ending up back to front.
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Post by Deleted on Jan 3, 2013 16:39:13 GMT
Thanks, guys. Are there any turntables left on the underground? If yes, do any actually get used?
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Post by grahamhewett on Jan 3, 2013 17:32:51 GMT
Didn't the early District stock also have the same problem (with A for Acton and D for Dagenham), presumably in case it got turned at the Gloucester Rd or even the Aldgate triangles?
GH
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Post by phillw48 on Jan 3, 2013 17:38:47 GMT
Didn't the early District stock also have the same problem (with A for Acton and D for Dagenham), presumably in case it got turned at the Gloucester Rd or even the Aldgate triangles? GH Most Underground stock were lettered A at one end and D at the other. The simple explanation is that most stock was in four car units lettered A-B-C-D. This system was in use before the District served Dagenham. |
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gantshill
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Post by gantshill on Jan 3, 2013 18:00:12 GMT
My memory of reading various books is that originally underground train cars had A end and B ends, but it was changed at some point to count the wheels on the trucks, so it went A, B, C and D, with what was B end becoming D end.
Although the idea of Acton ends and Dagenham ends is much more poetic.
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mrfs42
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Post by mrfs42 on Jan 3, 2013 20:41:12 GMT
Didn't the early District stock also have the same problem (with A for Acton and D for Dagenham), presumably in case it got turned at the Gloucester Rd or even the Aldgate triangles? GH Most Underground stock were lettered A at one end and D at the other. The simple explanation is that most stock was in four car units lettered A-B-C-D. This system was in use before the District served Dagenham. And when Acton Town was Mill Hill Park. It's a New York Subway thing... |
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Post by carltona on Jan 16, 2013 15:26:24 GMT
There is something near White City that looks a bit like a turntable pit but I don't think thats what it is. Would be interested to know what it actually is though.
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Post by tubeprune on Jan 22, 2013 7:26:58 GMT
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Post by tubeprune on Jan 22, 2013 7:27:54 GMT
There is something near White City that looks a bit like a turntable pit but I don't think thats what it is. Would be interested to know what it actually is though. There was a turntable at Wood Lane depot. *Edit:* It's shown here: www.trainweb.org/tubeprune/Wcdt001.gif |
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Post by Deleted on Jan 22, 2013 8:08:32 GMT
Would be interested to know what it actually is though. I have it from dim and distant memory that that circular feature which is under the Westway is a catchpit to take storm water although I've never seen any water in it. I may be wrong though. Andy |
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Post by tubeprune on Jan 22, 2013 11:16:50 GMT
Here's a grab from the OS map of 1936 showing the turntable at Golders Green depot. Attachments:
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Post by Deleted on Jan 22, 2013 11:25:23 GMT
Would be interested to know what it actually is though. I have it from dim and distant memory that that circular feature which is under the Westway is a catchpit to take storm water although I've never seen any water in it. I may be wrong though. Andy I am sure you are right as a now retired Central Line General Manager suggested that is what it was for. |
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Post by Deleted on Jan 22, 2013 11:37:06 GMT
Here's a grab from the OS map of 1936 showing the turntable at Golders Green depot. I am sure I remember it in the mid-1960s when I first joined LT. A photo of it (in 1956) can be seen on Snapper 31s website. |
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Post by carltona on Jan 27, 2013 10:35:41 GMT
The catchpit sounds right. Thanks for that.
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Post by metrailway on Jan 27, 2013 17:54:41 GMT
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roythebus
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Post by roythebus on Jan 31, 2013 20:59:30 GMT
I managed to get an R stock "wrong way round" one sunday in about 1971. A series of cable fires on a very hot day disrupted the service in the Earls court area; being a PG crew, we knew the Circle, so vounteered to go to Upminster via Kings Cross...On the way back, ISTR we went via Kings Cross again, but further cable fires meant we had to go round the Circle and turned at Mansion House.
Oh dear I noticed, in my usual observant way. We're the wrony way round...so had an empty trip back round the circle to get the stock right way round again!
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