The Rapido Trains HO Scale Procor GP20 20,000-Gallon Tank Car is based on tank cars built from 69 through 1984, so it'll look at home in your 1970s through 2020s freight consists. In the 1960s, Procor assembled their own engineering department and crafted a series of standard design tank cars which paved the way for a new generation of equipment, with many modern designs reflecting this new standard. The GP20 (again, the tank car and not the locomotive) was suitable for lighter density commodities which would not congeal or freeze in cold weather, such as various oils and fuel. The same car could also be equipped with interior heater coil pipes, such that the contents could be reheated. The same basic design -including tank diameter and length - was manufactured from 1969 until 1984. The GP20 was constructed with both 70 ton and 100 ton capacity trucks. Later designs were also equipped with a separate fittings dome (in addition to the manway assembly fitting), which allowed the tank ra