| Owner: | Missouri-Kansas-Texas |
| Type: | Box Car |
| AAR Class: | XM: Box car for general service equipped with side or side and end doors. |
| AAR Type: | B404 |
| Detail Info: | Unequipped Box Car, Inside Length: 49' to 59', cushion draft gear/underframe, Sliding doors, inside width less than 9ft 6in, Door opening 10ft to 11ft |
| Plate: | B |
| User Notes: | ACF 50' |
