| 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: | A606 |
| Detail Info: | Equipped Box Car, Inside Length: 69' to 79', cushion draft gear/underframe, Plug door, opening greater than 11 feet |
| Plate: | F+ |
| SP Class: | B-100-46 |
| Builder: | Berwick Forge & Fabricating |
| Max Gross Weight: | 263000 |
| Load Limit: | 164000 |
| Dry Capacity: | 7321 |
| Ext L/W/H: | 67' 9" / 10' 7" / 17' 0" |
| Int L/W/H: | 60' 9" / 9' 1" / 13' 2" |
| User Notes: | Berwick 7321 |
