CSX has little diesels in the rear hood/compressor room area but they have failed to maintain them (you're shocked, I know) They automatically run when temps get below freezing and circulate water throughout the engine block keeping it warm. Its not a Hot Start but along the same line as those...I forget the name off hand. In 5 switchers we have in Wyoming only one works and thats only sporadically. Good idea, probably got some tax credits to install them and then let em lapse.
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