A heated water/glycol mixture is used to preheat the engines of the customer's locomotives. The power source for the heater used to heat the mixture is the engine itself, which drives a variable frequency drive. The locomotive has several gears and operates over a range of RPMs, which means that the supply voltage to the heater varies from 184V to 552V. Because no standard heater design or control system is capable of handling such a large variance in supply voltage, a custom solution would be needed. - The solution begins with a Chromalox Water/Glycol Circulation Heater designed with six heating elements that can be wired electronically in up to six unique three-phase circuits. The control scheme monitors the locomotives gear and engine speed.

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