As far as the MTL passenger cars (made by Con-Cor) go, the snap-on pin standard with Con-Cor passenger cars, works with the KATO trucks. I think I did have to file the head of the truck pin down a little to clear the center axle on the 3 axle trucks. The standard KATO coupler sticks out too far for my taste, so I replaced them with short Unimate couplers, which easily fit the KATO trucks.