I like the ability of the MTH engines to be able to drop cars anywhere on the layout. I think that's what is one of the biggest features in O gauge. When upgrading other brands of engines to run on my layout, I still wanted that ability in any engine I chose to run and in any position in a consist. Adding the MTH couplers to USA trains engines was fairly easy. I believe I just screwed them onto the screw mount stand on those engines, using their spring mechanisms to keep the couplers straight. M