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Walk-through trains
On 13 Aug, 12:55, "DW downunder" noname wrote:
"Recliner" wrote in message ... "DW downunder" noname wrote in message . au "Recliner" wrote in message .. . "David Cantrell" wrote in message o.uk On Wed, Aug 12, 2009 at 10:26:30AM +0100, Recliner wrote: True, but the new Victoria line trains are longer, faster and more frequent, so that may account for some of the extra power. Longer? *When did the platforms get lengthened then? The new Victoria line trains will be the longest on the LU network, until the even longer new 8-car S stock trains enter service. Presumably they just stop further into the tunnels. But maybe answer the question: The '09 stock is longer than the 67 stock because the revised ATO is setup for a higher stopping accuracy. That means that more of the available platform is actually used, hence longer trains - not longer platforms. [BTW, as the trains are in tunnel all the time they carry pax, "... stop further into the tunnels ... " is a statement rather lacking in points of reference.] Also, elimination of intermediate driving cabs increases the total amount of space in the train made available to pax. OK, stop further into the running tunnels, but you already knew what I meant. But your other points do make sense. Incidentally, they're 3m longer than the old trains, which were already long by tube train standards. This might be another reason for them not ever being expected to run in service on other LU lines. Vic and Central were the only 8-car lines. With the Jubilee now 7-car (longer cars) and platform doors, clearly no cascade path there. Central Line has the additional central area restriction that presently leads to the outer (3rd) current rail being mounted higher than on the rest of LU lines and NR 3rd rail. So it seems that any semblance of integrated fleet management across LU has been abandoned for now. The '09 stock is IT for the Vic for the next 35-40 years unless it proves a lemon like the 83. Given the cautious steps towards introduction, there's a chance it'll prove at least a grapefruit if not a very nice juicy navel. The only possibility is extra stock for the Central Line being built based on the same development platform but to the more universal loading gauge ... *then if extra trains for the Vic were required at the same time, they may be to that more universal spec. That could only happen if more trains could be run on the Vic or some were damaged and needed replacing. More trains probably means changes to the signalling - anybody want to vounteer to be project manager? * Original train formation/length doesn't seem to stop 1972 stock being compatible with 1967 stock or 1992 stock running on the Waterloo & City. Units can be reformed. |
#2
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Walk-through trains
"MIG" wrote in message
Original train formation/length doesn't seem to stop 1972 stock being compatible with 1967 stock or 1992 stock running on the Waterloo & City. Units can be reformed. Not so easily with complex new stock. The W&C and Central were re-equipped at the same time with essentially identical trains, except that the W&C trains had only one pair of the two-car units. The W&C line was re-built at the same time. The 1972 stock is based on the 1967 stock, so they're very similar (but with different cabs, of course). Similarly, the 1995 and 1996 stocks are close cousins, but aren't electrically compatible. But the new 2009 stock is being supplied in fixed 4-car formations that wouldn't be easily re-formed. Its 8-car trains wouldn't fit any other tube line. Of course, things are going the other way on the SSL, with, for the first time ever, the same stock used throughout with the new S stock. |
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