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[quote user="nbrodar"][quote user="futuremodal"] I take it then that TOW rules were developed specifically for the RoadRailer technology, and have been subsequently applied to the superior RailRunner technology as well, even though the RailRunner system has operational advantages that would seemingly allow for reverse moves, distributed power, et al....I had an old RailRunner VHS tape that showed the product being tested at Pueblo, and I seem to remember a mention of this buff/draft strength and flexibility.  I wonder if RailRunner tried to get an exemption from the current antiquated rules for TOW's and was turned down?[/quote]The TOW rules deal specifically with RoadRailer type equipement. There's actually a list of banned and allowed trailer numbers in the rule book.Not being something we run, I haven't seen any rules dealling specifically with RailRunner. Looking at the RailRunner, I image they could fall under the rules for the old TTOX Front Runner cars.Nick[/quote]I would think the TTOX had more buff and draft specs than the RailRunner bi-modal chassis, if for no other reason than the weight differential favors a more rugged TTOX over RailRunner (25,000 lbs vs 9,000 lbs for RailRunner sans bogey weight). Here's an idea!  Why not allow bi-modal DPU's to run physically separated from the preceding portion of the consist?  That way, there's no chance of a crumpling push from behind unless the lead consist just plain stops dead in it's tracks.   Since DPU's are controlled by radio, is there really any need for physical connection to the other segments of the train, other than assisting with air supply and braking?Then again, I suppose there's some other antiquated FRA rule that requires DPU's to be physically connected to the controlling engine![banghead]  Well, then how about a "cushion car"?  This would be an intermediate unit placed behind the trailing unit of the forward portion of the consist and ahead of the trailing DPU locomotive.  It would have no real buff or draft resistance, but instead would allow for some "play" between the trailing TOW and the first DPU locomotive.
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