Electric, Train Motor 9V RC Train with Back Axles and Wheels, LEGO® Part# x1688c01. Made up of seven parts including 1 part# x1688 (Electric, Train Motor 9V RC Train), two part# 3706 (Black Technic Axle 6L), and four part# 55423c01 (Black Train Wheel RC, Spoked with Technic Axle and Rubber Friction Band). Appears in set# 8866-1 (Train Motor - RC), #7898-1 (Cargo Train Deluxe), and #7897-1 (Passenger Train). 

They have been tested to ensure they work. The part comes used in various conditions: Very Good, Decent, and Playtoy. Description for this part specifically is below:

Very Good: Part has only minor scratches - clips and technic pin intact.

Decent: Part may have scratches and marks - clips and technic pin intact.

Playtoy: Part is worn with scratches, dents and/or marks - clips may be missing and/or the technic pin is broken. 

If you’re looking for more train parts, call our store to see what’s in stock: 470-414-2208.