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Multiple working
Several locomotives running with a single driver / From Wikipedia, the free encyclopedia
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On the UK rail network, multiple working is where two or more traction units (locomotives, diesel multiple units or electric multiple units) are coupled together in such a way that they are all under the control of one driver (multiple-unit train control).
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If the front locomotive of a pair in multiple has failed the driver can still control the rear locomotive for as long as air and electricity supplies are available on the failed locomotive.
Many main-line diesel-electric and hydraulic locomotives are capable of running in multiples of up to three under the control of one driver
āāBritish Railways Diesel Traction Manual for Enginemen, [1]
In tandem is when more than one diesel or electric locomotive are hauling a single train and under the control of a driver on each locomotive.