I wonder how well these will pull? Are they going to be a small switchers equal with weight added, or will they have the staying power of a weak handcar/trolley and cook motors if you pull anything substantial?
Maybe double/triple headed?
Is there maybe something like an unpowered "Hump-T/Dummy -T" car ? ( )
The concept might allow a very small loco, or odd shaped locos (compressed air/mine locos, a low calf unit, etc,) with a very small or no motor in the loco/tender, being pushed along.