This detailed, ready-to-run HO Scale Trinity 5660 Pressure Differential Covered Hopper was introduced by Thrall Car in the 1999 for handling bulk powdered commodities. The Trinity 5660 features a detailed, injection-molded body, appropriate trucks with metal wheels, body-mounted AccuMate knuckle couplers and accurate decoration. The Trinity 5660 Pressure Differential Covered Hopper is one of many Atlas and Trainman HO Scale covered hoppers.