The history on these models is that they were originally commissioned by S-Helper Service and manufactured by American Models back in 1992. When their collaboration ended, American Models continued to produce and sell these cars to this day. The photos shown on this page are of the car as it arrived new.
From end-of-diaphragm to end-of-diaphragm, the body measures 13.25" or a scale 70'8". The model weighs 11.4oz (324g), which is about 2.75oz too heavy. The wheels are perfectly in gauge, according to the NASG standard. The car is labeled with "United States Mail", "Railway Express Agency", and road number 1620. I ordered the "scale" version, so it comes with scale wheels and truck-mounted fixed/dummy "scale" couplers. It has six-wheel trucks and there is electrical pick-up provided from the wheels. The underbody has some large components cast in, but no brakelines and only the bottom half of the cylinders are cast. There is a metal rod glued in between the centersills to give the car quite some heft. It comes with the fake silhouettes.
As with most "scale" modelers, the American Models cars make for a nice starter point. I will be adding, replacing, and improving much on this car. I will also need to do some more research to see if there is a prototype match for this car. According to S-Helper Service, this model was based on the New York Central prototype.