40' Modern Tank Car

Prototype Information

Stub sill tank cars began entering service in the mid-1960s. This design replaced the aging full center sill tank car. You can recognize a stub sill car by its lack of a solid underframe spanning the car’s length. Instead, the bolsters attach directly to the tank itself.

The industry often calls this the “modern tank car design.” From the 1970s onward, builders constructed the majority of general-purpose tank cars using this method. These models represent cars built starting in the mid-1960s that remain in active service today. This specific size and type of car transports a wide variety of industrial products. Common loads include asphalt, ethanol, fuel oil, and metal sodium. They also carry molten phenol, paraffin wax, tallow, urethane polyol, and vegetable oil.