Patent ID: 8550009

Claim:
A diesel-electric locomotive comprising: a diesel engine, an alternator driven by the diesel engine, wherein the output of the alternator is connected to a direct-current bus through a rectifier, at least one electric traction motor connected to the direct-current bus through a traction inverter, at least one piece of auxiliary equipment the input of which is connected to the direct-current bus through a power chain for shaping current, the power chain for shaping current comprising: an auxiliary inverter the output of which is connected to the input of a step-up transformer; the traction inverter; the step-up transformer; a back-up switch that selectively connects the step-up transformer to the direct-current bus through either the auxiliary inverter or the output of the traction inverter, wherein the traction inverter is configured to produce a current identical to that produced normally by the auxiliary inverter.