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[quote user="rrnut282"] Why would a Roadrailer train need Distributed Power Units?  They have ample H.P/Tonnage ratios.  [/quote]It has nothing to do with horsepower to tonnage ratios.  Rather, if one wishes for a bi-modal consist to exceed 150 units (the max allowed under FRA rules), one would need to employ a radio-controlled locomotive to be in charge of the extra units.  It wouldn't be distributed power in the context of shared power, but rather it would be a second section that is physically connected to the lead consist, and the second locomotive would be radio-controlled by the lead locomotive's engineer.The physical connection between the tail end of the lead segment and the second locomotive would have to be arranged in such a way so that there is no chance of the second locomotive pushing on the lead consist (in violation of the prohibition of using pushers on TOW's), only pulling the trailing consist.  Thus, the emergence of the "cushion car".
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