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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).

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
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.

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