These cars were originally sold by AHM/PMI and later on by Model Power. After Lima vanished, Model Power sold Chinese-made copies of these same cars (although some of the detailing on said copies is substantially different from the original Lima cars).
Combine (based on PRR MPB70/MPB70a) -
Coach (based on PRR P70) -
Observation (same prototype as the coach, just with an end-platform) -