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[quote user="nanaimo73"] FM- How about an adjustable length multi-unit car where center sections could be dropped or added to suit demand ? [/quote] Well, now you're opening up a whole 'nother can of ideas.  It should be possible to develop an adjustable length railcar based on the slider chassis concept.  If such is practical, then why not further apply the concept to multiple unit type cars?  One other idea I had a while back involved current bi-modal equipment.  What if, instead of having to have a loaded trailer for each bogie set, or having to load extra bogies on a flatcar if they are needed at the other end, we could just attach the bogies to the end of the consist with a hand held drawbar connecting each free wheeling bogie to the next?  This would allow more flexibility of bi-modal operations.
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