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Bakerloo Line beyond Harrow & Wealdstone
On Tue, 25 Nov 2008 08:57:17 +0000, David Hansen
wrote: On Mon, 24 Nov 2008 20:32:20 -0000 someone who may be wrote this:- Is a fourth rail really necessary out that way, however? I always understood that they were really needed only for the tub sections of the tube, to help power flow into the motors. I heard this on the Island Line, where 38 stock operates only with a 3rd rail. It operates there after being modified to allow the traction supply to travel via the running rails. Heavy electric currents through bearings is not a good combination, hence the modification. There was IMU some trouble of that nature when c.501s were converted from 4-rail to 3-rail in the early 1970s. |
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