If you guys will go back in railroad history and read about "Pony Engines" you will find this same senerio. In the switching yard, pony engines did not have steam boilers. They were hooked up to prime locomotives to load a large holding tank with super heated water. The pony engine would move rail cars around the yard and do all the necesary switching etc. by injection and flashing the super heated water into motive steam very simply. You are revamping history. Norm


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