I got one of these to run on the mountain spur. Unfortunately, it appears the coupler won't hold with either the Bachmann old-time coaches or the Atlas 60' cars. The MT couplers on both cars are too high to connect with the engine. The tender's brake hose gets stuck on the unitrack (exploded the coupler trying to file it, but it was going to run in push mode anyway), and the engine's coupler is similarly too low. Has anyone else had this problem with coupler height?