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
- 27 more...
- ItemChristianson000060 - Burlington Northern diesel locomotives Number 306, Number 307, Number 309 and Number 6020 in Minneapolis, Minnesota in 1980
- ItemChristianson000061 - Burlington Northern diesel locomotive Number 311 at Fargo, North Dakota in 1981
- ItemChristianson000062 - Burlington Northern diesel locomotive Number 318 at unknown location in 1979
- ItemChristianson000063 - Burlington Northern diesel locomotive Number 388 at Albany, Oregon in 1982
- ItemChristianson000064 - Burlington Northern diesel locomotive Number 393 at Northtown, Minnesota in 1980
- ItemChristianson000065 - Burlington Northern diesel locomotives Number 393 and Number 394 at Northtown, Minnesota in 1981
- ItemChristianson000066 - Burlington Northern diesel locomotive Number 435 at Kansas City, Missouri in 1980
- ItemChristianson000067 - Burlington Northern diesel locomotives Number 436 and Number 555 at Kansas City, Missouri in 1980
- ItemChristianson000068 - Burlington Northern diesel locomotive Number 451 at Minneapolis, Minnesota in 1982
- 32 more...