Your Like and Subscription are Appreciated! A little something different. This is a demonstration of a motor swap between Mavis and Diesel 10, Mavis is a MattelTrackmaster and Diesel 10 is a TOMY. Mavis was running very slow so a Diesel 10 motor has been put in and she is running much faster!\rbr\rbrThis is for entertainment purposes only. Have a grown up help you with any kind of disassembly or repair.