driver, as in the great majority of first-generation British Rail DMUs but, in most applications, gears are changed automatically.

Diesel-hydraulic

In a diesel-hydraulic multiple unit (DHMU), a hydraulic torque converter, a type of fluid coupling, acts as the transmission medium for the motive power of the diesel engine to turn the wheels. Some units feature a hybrid mix of hydraulic and mechanical transmissions, usually reverting to the latter at

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