| Owner: | Southern Pacific |
| Type: | Box Car |
| AAR Class: | XM: Box car for general service equipped with side or side and end doors. |
| AAR Type: | B100 |
| Detail Info: | Unequipped Box Car, Inside Length: Less than 49', Sliding doors, inside width less than 9ft 6in, Other type door/opening |
| Plate: | B |
| SP Class: | B-50-24 |
| User Notes: | Mt Vernon box conv to express |
