This article has the aim of considering the several kinds of hydraulic transmissions for switching light rail motor tractors endowed with one or two converters for each direction of traffic and all with gears of the constant type. The general design principle and in particular the cooling equipment and also their performances considering more specifically the cases of 300 and 600 HP are considered. The regulation is always made filling and empying the correspondent converter.
It is also studied the functional comparison between the DH locomotives and the three-phase current diesel-electric type.
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