| Owner: | Union Pacific Railroad Company |
| Type: | Centerbeam Flat |
| AAR Class: | FBC: Flat car constructed with a center beam above the car deck from bulkhead to bulkhead. |
| AAR Type: | F283 |
| Detail Info: | Flat Car, Load Limit: 155,000-184,999lb, Inside length: 60-75ft |
| Plate: | B |
| UP Class: | F-100-21 |
| Max Gross Weight: | 263000 |
| Load Limit: | 184800 |
| Ext L/W/H: | 70' 6" / 10' 1" / 15' 1" |
| Int L/W/H: | 61' 0" / 10' 0" / 0' 0" |
| User Notes: | blt 1970 by Thrall |
