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[quote user="CSSHEGEWISCH"] [quote user="futuremodal"]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.[/quote]FM really needs to do his homework on this issue.  If such a rule even existed, DPU and its predecessors could not be operated in the first place since by definition there was no direct physical connection between the controlling(master) unit and the remote (slave) units because of the intermediate freight cars.[/quote]Paul, do you ever get tired of trolling?Do you even know what you're talking about?  DPU's are radio controlled, not by physical connection with the lead units (as in a typical locomotive lash-up).  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.
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