Dick H wrote:AFAIK, none of these GPs can use antifreeze and they do not have APUs.
Railroad Diesel locomotives (not just the GPs) don't use antifreeze because undiluted water is a more efficient cooling agent. An antifreeze-based cooling system would require 20 percent more cooling capacity, which would be difficult to accommodate because even modern locomotives' cross-sections must fit railroad tunnels built more than 100 years ago. The new GM EMD "H" engines are designed to use it. However, problems with leaks and seals and the expense of putting a 100 gallons of coolant into a 3,000 hp engine, means that engines have traditionally operated without it. In cold weather, the engine is left running or the locomotive is kept warm by putting it into a heated building or by plugging in a shore supply. Another reason for keeping diesel engines running is that the constant heating and cooling caused by shutdowns and restarts, causes stresses in the block and pipes and tends to produce leaks.
Dick, what did you mean by APUs? Did you mean Hot Start units?
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