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Post by Deleted on Dec 14, 2010 22:15:57 GMT
Edit By Colin: I have created this thread by moving posts out of the thread titled "End of an era?" which is located in the Metropolitan line area - clearly it went way off topic both for the thread and board - this is the more appropriate area for the Olympia part of the discussion which is why it's now here.Ah, but he asked for "the end of 4-car trains on the [...] LU system"  Earlier I always thought the Olympia service was three car, no idea why! Probably as it's more quieter a service.
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Post by ruislip on Dec 15, 2010 15:53:48 GMT
Aren't there some services on this branch that use 7-car D stock? |
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DWS
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Post by DWS on Dec 15, 2010 16:01:57 GMT
Aren't there some services on this branch that use 7-car D stock? D stock is 6 cars  |
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Post by ruislip on Dec 15, 2010 16:13:02 GMT
For some reason I thought that all D stock is 7 cars.
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Post by Deleted on Dec 15, 2010 16:19:19 GMT
D stock units are either A end DM - T - UNDM, UNDM - T - D end DM, or A DM - T- D DM.
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metman
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Post by metman on Dec 15, 2010 16:29:06 GMT
For some reason I thought that all D stock is 7 cars. The R stock was 7 cars (1971-83) and 6/8 before that. |
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Post by Deleted on Dec 15, 2010 18:14:14 GMT
Dont know why Olympia isnt 3 car during Off-Peaks and weekends. Just keep a double ender on hand at Lillie Bridge
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metman
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Post by metman on Dec 15, 2010 19:07:35 GMT
More hastle probably than its worth.
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Chris M
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Post by Chris M on Dec 16, 2010 9:57:37 GMT
With full length trains, they can be diverted more easily if required.
Also, the last time I travelled between Earl's Court and HSK at a weekend a full-length train was needed.
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Post by Deleted on Dec 16, 2010 9:59:54 GMT
Dont know why Olympia isnt 3 car during Off-Peaks and weekends. Just keep a double ender on hand at Lillie Bridge I suppose there's something with the compressors too, isn't there (number of compressors in a double ended D78 or something)? |
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Post by Deleted on Dec 16, 2010 10:44:31 GMT
Dont know why Olympia isnt 3 car during Off-Peaks and weekends. Just keep a double ender on hand at Lillie Bridge I suppose there's something with the compressors too, isn't there (number of compressors in a double ended D78 or something)? A double ended D stock unit has 2 compressors, as they were designed to operate on their own, so that's not an issue. |
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Post by Dstock7080 on Dec 16, 2010 12:50:42 GMT
Dont know why Olympia isnt 3 car during Off-Peaks and weekends. Just keep a double ender on hand at Lillie Bridge This has been discussed before, where would you stop the train in the platforms at Earl's Court and how would you communicate this stopping arrangement to passengers? |
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Post by Deleted on Dec 16, 2010 13:03:01 GMT
National Rail manage to do thsi with different length trains during peak/off peak. Shouldn't be that hard to do.
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Post by Deleted on Dec 16, 2010 13:09:05 GMT
National Rail manage to do thsi with different length trains during peak/off peak. Shouldn't be that hard to do. But they have very different systems. To run regular short trains on LU would require CSDE modifications, OPO camera/mirror modifications, all sorts of works because of the systems they have. I don't think it's particularly feasible - plus, having a double ender seperate is pointless. According to Tubeprune's website there are 75 D stock trains. I don't think any have been scrapped. So there's an even amount of units, that means pulling out a double ender and uncoupling it. Why bother, when you can shove in the extra capacity and gain operational flexibility? On the Southeastern metro lines there are OPO monitors. But these have been laid out well, for different train lengths. You can't just toss in a train of a different length without the right equipment on LU. |
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Post by rincew1nd on Dec 16, 2010 21:27:48 GMT
Briefly going back to where this thread started (before it was moved here), I noticed that Chesham had an OPO mirror half-way along the platform for the shuttle, and a full video set up on the platform end for the through trains. So it is do-able, but is it worth it?
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Post by Deleted on Dec 16, 2010 21:56:22 GMT
'This has been discussed before, where would you stop the train in the platforms at Earl's Court and how would you communicate this stopping arrangement to passengers?'
Everybody seemed to cope easy enough with different length stock till all this H&S rubbish started!
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Post by Deleted on Dec 16, 2010 23:22:20 GMT
People seem to manage on various stations on the north side of the Circle too E: And aren't the LO trains going to Richmond a bit shorter than a six car D78 too? |
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Post by norbitonflyer on Dec 16, 2010 23:46:43 GMT
People seem to manage on various stations on the north side of the Circle too And the south! Indeed all the way from Barking to Wimbledon - a 6 car C stock is a lot shorter than a 6 car D stock. Rayners to Uxbridge is another example. |
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Post by Deleted on Dec 17, 2010 9:50:27 GMT
But those stations have the correct OPO equipment, and where with a crossover, should also have the correct CSDE loops.
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Post by Deleted on Dec 18, 2010 23:45:06 GMT
I certainly cope fine on the Uxbridge branch
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Post by Tomcakes on Dec 19, 2010 20:16:13 GMT
Looking at it from the other side - is there any point in modifying systems for a 3-car instead of a 6-car unit during the day? What saving made by using fewer trains at offpeak times is worth that cost and hassle?
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Post by Deleted on Dec 19, 2010 20:20:01 GMT
My point about there being an integer number of D stock trains appears to have been overlooked. There is no point in uncoupling a unit between the peaks, when it couldn't be used to form another train anyway!
And before someone points out it could be used to remedy a defective train - it's a lot better to cancel a higher frequency run like on the central section than to pull an Olympia shuttle in the peak, because the former will have to wait a lot less time for the next train!
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