Engine warming system for a multi-engine machine

A method of warming an engine comprising:

• circulating coolant from a first engine through a first heat exchanger;
• circulating coolant from a second engine through a second heat exchanger;
• selectively directing a coolant flow from the first engine and from the second engine through a common heat exchanger such that coolant from the first engine is used to heat coolant from the second engine;
• and
• selectively directing a coolant flow from the first engine and from the second engine through the common heat exchanger such that coolant from the second engine is used to heat coolant from the first engine.

A locomotive comprising:

• a platform;
• a plurality of wheels configured to support the platform;
• a first engine mounted on the platform;
• a second engine mounted on the platform;
• a first heat exchanger fluidly connected to the first engine and configured to cool the first engine;
• a second heat exchanger fluidly connected to the second engine and configured to cool the second engine;
• a common heat exchanger fluidly connected to the first engine and the second engine to transfer heat between coolant from the first engine and coolant from the second engine;
• a first pump configured to circulate coolant from the first engine through the first heat exchanger;
• a second pump configured to circulate coolant from the second engine through the second heat exchanger;
• a third pump configured to circulate coolant from the first engine through the common heat exchanger;
• a fourth pump configured to circulate coolant from the second engine through the common heat exchanger;
• a first thermostatic valve configured to control a flow rate of coolant from the first engine through the common heat exchanger;
• a second thermostatic valve configured to control a flow rate of coolant from the second engine through the common heat exchanger;
• and
• a controller configured to control the third and fourth pumps to selectively direct coolant flows from the first and second engines through the common heat exchanger such that cooler coolant from either of the first and second engines is heated by warmer coolant from the other of the first and second engines.