Back in BR days there was a Prototype of a Suburban 'DMU' that had no underfloor engines just one large engine by one of the driving cabs so subsequently didn't power the other axles. The unit did testing around Reading for half a year until it disappeared and most likely was scrapped.Seth said:I think the following extract from Alan A. Jackson's The Railway Dictionary may be of interest here:
Multiple Unit/MU
An electric (EMU) or diesel-electric powered (DMU or DEMU) train in which the motive power is distributed over a number of car axles instead of being concentrated in a loco or driving car.
Does that sound like the sort of definition which can be applied to an IC125?
Did a Thumper DEMU have individual powered axles?