| Owner: | Baltimore & Ohio |
| Type: | Open Hopper |
| AAR Class: | HMSR: 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. Equipped with roof |
| AAR Type: | K370 |
| Detail Info: | Hopper, Load Limit: 185,000 and greater, Non-rotary couplers |
| Plate: | B |
| BO Class: | HMSR |
| User Notes: | 3 Bay |
