An auxiliary engine warming system for a primary engine in a diesel locomotive including: a modular engine assembly including an auxiliary diesel engine, the assembly displaceable as a unit from and to a frame for the engine warming system; an auxiliary fuel tank including a fuel line detachably connected to the auxiliary engine and including a first fitting detachably connectable to a first fuel line for a fuel tank for the diesel; at least one temperature sensor interfacable with the diesel locomotive and arranged to monitor at least one temperature condition for the diesel locomotive; and an emergency dialer for automatically dialing a preprogrammed number and transmitting an alert message in response to an alarm signal from the at least one temperature sensor.