Patent ID: 7059278

Claim:
An engine cooling system for a locomotive having an engine equipped with a compressor for compressing engine intake air, an aftercooler for cooling the compressed engine intake air, and a dynamic braking system having a dynamic brake grid and at least one cooling fan positioned in fluid-thermal communication with the dynamic brake grid, said engine cooling system comprising: an engine cooling circuit having coolant passages in the engine and a radiator configured to receive coolant exiting the engine and return cooled coolant to the engine; and an aftercooler cooling circuit having a coolant-to-air heat exchanger disposed in fluid-thermal communication with said at least one dynamic brake grid cooling fan such that said brake grid cooling fan is operatively associated with both the dynamic brake grid and the heat exchanger, a heat exchanger coolant supply conduit providing fluid communication between said engine and the heat exchanger, a heat exchanger coolant return conduit providing fluid communication between said heat exchanger and the aftercooler, and an aftercooler fluid conduit configured to pass coolant exiting the aftercooler to said engine cooling circuit.