| Owner: | Norfolk Southern |
| Type: | Flat Car |
| AAR Class: | HM: Open top self-clearing car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged crosswise of car and dumping between rails. |
| AAR Type: | H340 |
| Detail Info: | Unequipped Hopper, Load Limit: 185,000 and greater, Non-rotary couplers |
| NS Class: | HS31 |
