Recieved a Micro Trains runner pack, of 4 Santa Fe tank cars. Of them,I’ve got one car that appears to have a warped frame! Won’t stay on the track! Trucks sit at a slightly funny angle, so flanges ride across top of rails! Did manage to loosen truck bolster pin, so trucks ride a bit better. Still not perfect, but at least the car tracks now, forward and back, at front or rear of about a 20 car train, on 11” curves! One of 3 small N Scale layouts! Just the only one I have easy access to at the moment! When knee returns to usability, I’ll be able to access the other 2 layouts! Is it possible to get a replacement frame from Micro Trains? Asking here, but also going to contact MT about it. Haven’t yet, but it’s next on my list of things to do! Information much appreciated! Thanks.