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| Re: Preview of R-32 For BVE Teaser.... (330058) | |||
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Re: Preview of R-32 For BVE Teaser.... |
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Posted by tydev417 on Sat Oct 28 13:06:11 2006, in response to Re: Preview of R-32 For BVE Teaser...., posted by South Brooklyn Railway on Sat Oct 28 12:18:53 2006. The London Underground uses a 4-rail system where both the conductor rails are live relative to the running rails (the rails used by the train's wheels) though the positive rail has twice the voltage of the negative rail. On the London Underground a top-contact third rail is placed beside the track, energised at +420 V DC, and a top-contact fourth rail is located centrally between the running rails at -210 V DC, which combine to provide a traction voltage of 630 V DC. Arcs like this are quite normal and occur when the electric power collection "shoes" of a train that is motoring (ie: drawing power) reach the end of a section of electric power rail. 
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