I still haven't got to testing the more modern passenger equipment messing with the coupler heights and finally ended up junking one coach car that did not want to run well. Kept the car body to use as a building maybe and junked the underframe. Still have no idea why the 4-4-0 continues to drop the pony truck but it has three more times. Checked the pony truck on one and found the wheels just slightly out of gauge and adjusted those. Even with those tweaked still ended up with binding at the grade crossing that both my S-4 and 70 tonner are running through fine. May just junk the front pilot and replace it with a switcher pilot and run it as an 0-4-0 since it seems to run better that way. Meanwhile my passenger cars, older era, are running happily behind a 70 tonner. And since it has a timeline of 1946 to the mid 50s it fits my era perfectly. So now down to ten steam locos if I rework the 4-4-0 into a 0-4-0.