| Owner: | Martin Marietta Materials Incorporated |
| Type: | Ballast Hopper |
| AAR Class: | HMA: (Ore Car) Open top self-clearing car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. |
| AAR Type: | K384 |
| Detail Info: | Hopper, Load Limit: 185,000 and greater, Less than 3000 cu ft capacity *Light Density Service |
| Plate: | B |
| Max Gross Weight: | 286000 |
| Load Limit: | 232900 |
| Dry Capacity: | 2480 |
| Ext L/W/H: | 45' 0" / 10' 8" / 13' 5" |
