I acquired eight of these electrocoupler Lionel trucks recently, and only two of them work, and they work just barely. They appear to have a bad design where the plunger won't go in far enough to release the knuckle. Clearly Lionel and mad ein China - can anyone ID this truck?
They also have a mystery silver wheel mounted on the splined axle - what is this for? Looks like some sort of flywheel...