| Owner: | Atlantic and Western |
| Type: | Box Car |
| AAR Class: | XM: Box car for general service equipped with side or side and end doors. |
| AAR Type: | B304 |
| Detail Info: | Unequipped Box Car, Inside Length: 49' to 59', Sliding doors, inside width less than 9ft 6in, Door opening 10ft to 11ft |
| Plate: | B |
| Max Gross Weight: | 220000 |
| Load Limit: | 162400 |
| Dry Capacity: | 5075 |
| Ext L/W/H: | 55' 7" / 10' 8" / 15' 0" |
| Int L/W/H: | 50' 6" / 9' 4" / 10' 7" |
| User Notes: | ex AN 7031 |
