Very impressive setup, and I do have the MPC "General" locomotive that I've been wondering what to do with. Unfortunately, 1/25 railroad cars are quite expensive.
I haven't built this kit specifically, so I can't attest to the decals; but I have built the Kenworth T600A & the Fruehauf trailer.
Of note, I did swap out the spokes in the kit for the disks from the tank trailer kit.
Great looking Coronets. Very well done.
I built the Polar Lights Snap Coronet 500 some time ago, and the only issue I had was the holes in the hood for the air cleaners don't line up with the air cleaners. They are too wide on the engine. Did you experience this?