Here's some pictures comparing the N-Drive mechanism to a Bachmann.

Here the N-Drive mechanism is on the right. The Bachmann mechanism on the left has Nigel Lawton's re-motoring kit and a new worm from NWSL installed. The biggest difference is the motor position: it sits much closer to the worm and rear drivers. So use of the mechanism with the Chivers small Forney kit (RC-45) requires some modification.


Here's the N-Drive mechanism with a new boiler made out of 2 sizes of brass tube so that the Chivers smoke box casting will fit into it. The motor fits inside the new boiler. I think this will allow the Chivers kit to use this mechanism.
The last two photos show Bachmann and N-Drive chassis for comparison. Note that the drivers are a little smaller on the N-Drive chassis and the wheel base is a little shorter. The chassis in front in the last photo is Bachmann with the original motor, boiler and cab floor to be used in a Kennebunk Models resin forney kit now out of production.

N-Drive Website

Thanks to Stephen at http://fairlightworks.blogspot.com/ I've discovered that N Drive Productions has a website now:

http://www.n-driveproductions.com/

The range and prices page are the correct prices for the 9mm (N scale) drive.

Note that the wheel base and motor location are different from the Bachmann drive it replaces.

Here's the N-Drive order form.