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[quote user="nbrodar"][quote user="futuremodal"] There is no technological reason why a trailing unit physically separated from the lead consist cannot still be controlled by the lead unit.  So that leaves it to either a regulatory issue or the fact that no one has thought this up yet, since bi-modal operations are still a rare occurance.  Since there doesn't seem to be any cut and dried rules regarding DPU's in TOW's, only regs against pushers, my bet is on the latter.[/quote]Once you pull that pin...the DPU and anything behind it becomes a seperate train, requiring it's own crew.   The government bans the use of unmanned/remote leading locomotives outside of an active Remote Control Operation Zone.  Nick[/quote]I could see why an unmanned consist out on it's own is a bad idea, but why would a trailing consist that's say 100' behind the lead consist be a danger?  Maybe the possibility of a driver at an unmarked rail crossing instinctively starting out across the crossing without looking back past the first trailing consist?As unconventional as it sounds, the idea of a "cushion" car in front of a DPU may not be all that far-fetched if indeed the viability of bi-modal operations is contingent on maximizing the number of units beyond 150, or in preventing stringlining around mountain curvature.  That would allow for a physical connection of the DPU with the lead consist, yet would prevent any variations in force between the trailing DPU and the lead engine's consist from crumpling one of the lead consist's trailers/chassis.
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