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
- 402 more...
- ItemChristianson000482 - Burlington Northern Diesel Locomotive 6505 at Minot, North Dakota in 1981
- ItemChristianson000483 - Burlington Northern Diesel Locomotive 6594 at Saint Paul, Minnesota in 1981
- ItemChristianson000484 - Burlington Northern Diesel Locomotive 6605 at Minot, North Dakota in 1976
- ItemChristianson000485 - Burlington Northern Diesel Locomotive 6613 at Minneapolis, Minnesota in 1981
- ItemChristianson000486 - Burlington Northern Diesel Locomotive 6615 in 1981
- ItemChristianson000487 - Burlington Northern Diesel Locomotive 6621 at Minneapolis, Minnesota in 1981
- ItemChristianson000488 - Burlington Northern Diesel Locomotive 6621 at Saint Paul, Minnesota in 1980
- ItemChristianson000489 - Burlington Northern Diesel Locomotive 6621 at Saint Paul, Minnesota in 1980
- ItemChristianson000490 - Burlington Northern Diesel Locomotive 6624 at Staples, Minnesota in 1981
- 148 more...