This Lima class 73 has received a (believed 6v) motor salvaged from a CD drive, a Scalextric drive pinion, and a DCC Concepts 8 pin socket harness. Plus a drive gear with 70% more teeth which means the rear axle is actually driven now.
It's a vastly different beast now. It picks up immediately, and runs much more quietly. This is despite the fact I still have work to do on it -- it could use a full set of pickups on the trailing bogie for a start, and it's still rolling on the original Lima wheels, too.