Bachmann core motor for many Bachmann locos. Appears a part number 31-355 Fits Class 03/04 split chassis. This is just the core motor, and you will need to re-use your own existing worm gears or flywheels. These can be removed from your old motor with a bit of heat. This motor is not a cheap 3v or 6v motor, this motor is rated correctly for all models and controllers. This is the same core motor that Bachmann sell with with gears or flywheels. All motors are checked for smooth operation before they are sent. Orders placed before 3pm will be dispatched same day. Other Bachmann motors available in other items. If you have any questions, please ask!