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This is a practice that goes way back. In the old days no head gaskets [pressure fit] of any kind were used and the water would leak into the crankcase [among other places] and get into and dilute the oil. There for the railroads did not use antifreeze. When an engine was started, a person always opened the flashcocks and turned the engine over a few times. This was done to remove any water that might have leaked into the cylinders.[water doesn't compress]. After the water was removed, the flashcocks were shut and the engine started. Incidentally several methods were used for starters. The most common were the generators, but there also was the air starter.Alco used it in the late 60s on their C series of locomotives
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