Well, you did a brilliant job refurbishing it.
I'm wondering if there's enough room for a small can motor in the loco, and if so, will it have enough zip to move it. Might require a worm-gear configuration with the can in the cab.
I have a prewar 1684 that tends to run hot after 10-15 minutes of run-time. Lubrication seems to provide some relief, but not much.
PD