Most handcars have a simple rectifier to drive the motor with no reverse. That's what I started out with for my K-Line clown car. I kinda' went "all in" and added command control and sounds. The Minnie Mouse trailer you posted is a similar concept with just a conventional reverse unit, but he mentions extra pickups. FWIW, I actually used an old powered chassis for the trailer so I could have two more pickups With eight wheels and four pickups, I haven't had any issues with this stalling on any switches and the like.
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