| Owner: | Southern Pacific |
| Type: | Box Car |
| AAR Class: | XP: Boxcar similar in design to "XM", but which is specially equipped, designed, and/or structurally suitable for a specific commodity loading; except, boxcars (XF, XM, XMI) dedicated to the transportation of commodities in paragraph A, Rule 97, AAR Interchange Rules, must be designated "XP". |
| AAR Type: | A403 |
| Detail Info: | Equipped Box Car, Inside Length: 49' to 59', cushion draft gear/underframe, Sliding door, opening greater than 11 feet |
| Plate: | C |
| SP Class: | XM |
