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Why do Central Line trains sometimes jolt as they e leaving the station?

April 26, 2017jolt leaving line station trains

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Why do Central Line trains sometimes jolt as they
e leaving the station?

1 Answer

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LU uses a four-rail system, not a three-rail system. Electricity is transmitted both through the middle rail and the rail on the side of the track. I don’t think this changes in stations, but it is different from many metro systems, so that may be what unSane is remembering. A peculiarity of the Central Line is that trains run automatically between stations. This happens on the Victoria line as well, but with an older system. You may be experiencing a shift between manual and automatic control. That would be my first guess anyway. If you want a reliable answer, ask on the newsgroups uk.transport.london and uk.railway which are full of signalling geeks, real tube train drivers, and other TfL/railway employees.