Thanks for the response Ken!
Very interesting, I actually had the same reaction. I knew an engine with no speed regulation would run like garbage but I didn't know quite how bad it would be. I actually planned all along to put the ERR Cruise M in this engine along with the JW&A chuff generator and super chuffer. But yeah the way it bucks under certain conditions unfortunately points to binding. It usually doesn't do this so it's probably usable like it is, but whenever the track twists just the wrong way it starts acting up
