Railroad Archives Online
- CollectionD0504b - Al Christianson Collection - Friends of the Burlington Northern Railroad
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 428 more...
- ItemChristianson000508 - Burlington Northern Diesel Locomotive 6799 at Minneapolis, Minnesota in 1981
- ItemChristianson000509 - Burlington Northern Diesel Locomotive 6799 at Minneapolis, Minnesota in 1981
- ItemChristianson000510 - Burlington Northern Diesel Locomotive 6805 at Minneapolis, Minnesota in 1981
- ItemChristianson000511 - Burlington Northern Diesel Locomotive 6810 at Saint Paul, Minnesota in 1981
- ItemChristianson000512 - Burlington Northern Diesel Locomotive 6819 at Minneapolis, Minnesota in 1982
- ItemChristianson000513 - Burlington Northern Diesel Locomotive 6830 at Galesburg, Illinois in 1979
- ItemChristianson000514 - Burlington Northern Diesel Locomotive 6920 at Minneapolis, Minnesota in 1982
- ItemChristianson000515 - Burlington Northern Diesel Locomotive 6928 at Sabin, Minnesota in 1982
- ItemChristianson000516 - Burlington Northern Diesel Locomotive 6928 at Barnesville, Minnesota in 1982
- 122 more...