KATO bogie drives
These N gauge chassis come with a traditional 12V motor. Also very popular with H0e/OO9 fans.
Distance between centre bogies: 32 mm
Wheelbase bogie: 11mm
Diameter wheels: 5.2 mm
DCC operation possible, though you would have to open the model (clipped) and solder wires. Suitable decoders are available here.
KATO two axles drives
These 12V N gauge chassis come with factory installed coreless motor and flywheel. Also very popular with H0e/OO9 fans. They replace the classic 11-103 and 11-104.
A complete take-a-part can be found here