| Owner: | Union Pacific Railroad Company |
| Type: | Box Car |
| AAR Class: | RBL: Bunkerless refrigerator car with or without ventilating devices and with or without device for attaching portable heaters. Constructed with insulation in side ends, floor and roof to meet maximum UA factor requirement of 250 BTU/F/Hour for 50 foot cars and 300 BTU/F/Hour for 60 foot cars. Equipped with adjustable loading or stowing device. |
| AAR Type: | R310 |
| Detail Info: | Refrigerator Cars, Inside Length: 49ft to 59ft |
| Plate: | B |
| UP Class: | BI-50-3 |
| User Notes: | blt UP RBL |
