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The chassis is a central motor type with the capability to drive all axles, but the implementation used in the Underground Ernie models only drives both axles on one bogie (two car EMUs don't really need any more traction). I suspect that you could buy a new double-ended motor and with the parts from two chassis make a four axle drive chassis, and do away with the traction tyres if you are keen. The chassis is DCC ready with an 8-pin socket. As supplied top speed is not very high (I would guess about a protypical 30-40 mph in 7mm) so you might like to consider that if remotoring. Current pickup tends to be a bit temperamental out of the box, but they get better after ten or so hours of running - another reason to remotor and do away with the traction  tyres.