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Central line to be converted to AC?
On Apr 21, 12:46*pm, Mizter T wrote:
On 21 Apr, 11:39, "Paul Scott" wrote: "thoss" wrote: At 03:06:46 on Mon, 21 Apr 2008 Boltar opined:- Change the traction package on a unit, and put it back in service. Don't see why that would require closing the line. * It might not be possible to couple a DC unit and an AC unit in a single train, but they can certainly share the same track and power rails. If they do it lets hope they don't reduce the performance of the central line trains to the slug like performance of the northern line ones. The central trains are the only ones on the tube that have anything approaching the decent acceleration that you'd expect on a modern metro. Is that because of the trains or because on the tube sections acceleration is aided by gravity? It is because the Central line has full automatic train operation (ATO), which for normal day to day use drives the trains nearer the limits than manual driving can. *There is no reason why a change from DC to AC traction would make performance worse, in fact it ought to improve AFAICT. Indeed - it's all about the ATO. There is also the fact that all axles are motored on the Central line's 1992 stock, whilst the Northern line's 1995 stock has two trailer cars per 6 car unit. This means that the '92 stock is lighter (per car). Having every axle motored generally allows better acceleration, if all other things are equal. It will be interesting to see how the Northern stock performs, once the trains are used to their full potential. |
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