The BJ was a compact powerful B-B diesel-hydraulic design equipped with a medium speed engine. The class was built at Beijing Feb 7th Works from 1975 to 1991 and dominated passenger traffic around the capital until the early 1990s. They were later cascaded to secondary lines before withdrawal.
- C2 Class NG 0-8-0
- ET7 Class 0-8-0T
- GJ Class 0-6-0T
- JF Class 2-8-2
- JS Class 2-8-2
- KD6 Class 2-8-0
- QJ Class 2-10-2
- RM Class 4-6-2
- SL6 Class 4-6-2
- SY Class 2-8-2
- XK13 Class 0-6-0T
- YJ Class 2-6-2
- DF4, DF4A, DF4B Class
- DF4C Class
- DF4D, DF4DD Class
- DF5, DF5B, DF5D Class
- DF7, DF7B/C/D/F Class
- DF7G Class
- DF8 Class
- DF8B Class
- DF11 Class
- DFH3 Class
- GKD1, GKD1A Class
- HXD3B/3C/3D Class
- SS3, SS3B Class
- SS4, SS4G Class
- SS9, SS9G Class
- 37E Class
- ED85 Class
- EL1 & EL2 Class
- ZG100 & ZG150 Class
- Narrow Gauge Electrics
- NYJ1, NZJ1, NZJ2 Class