British Rail Class 19
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Class 19[1] is the name given to an experimental railway locomotive that was constructed using a Mark 3 DVT. The locomotive is part of a project funded by the Rail Safety and Standards Board (RSSB) to test the viability of combining hydrostatic transmission with a form of regenerative braking that can reduce engine emissions.[2]
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Hydrostatic transmissions have been used previously for rail vehicles, but only for slow-speed track maintenance vehicles and similar, not for mainline locomotives. Diesel-hydraulic locomotives instead use a hydrodynamic, i.e. torque converter, transmission.