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
- 395 more...
- ItemChristianson000450 - Burlington Northern diesel locomotive 6253 at Minneapolis, Minnesota in 1977
- ItemChristianson000476 - Burlington Northern Diesel Locomotive 6475 at Saint Paul, Minnesota in 1980
- ItemChristianson000477 - Burlington Northern Diesel Locomotive 6502 at Minneapolis, Minnesota in 1981
- ItemChristianson000478 - Burlington Northern Diesel Locomotive 6511 at Minneapolis, Minnesota in 1980
- ItemChristianson000479 - Burlington Northern Diesel Locomotive 6523 at Fort Worth, Texas in 1981
- ItemChristianson000480 - Burlington Northern Diesel Locomotive 6526 at Fort Worth, Texas in 1981
- ItemChristianson000481 - Burlington Northern Diesel Locomotive 6571 at Minneapolis, Minnesota in 1981
- ItemChristianson000482 - Burlington Northern Diesel Locomotive 6505 at Minot, North Dakota in 1981
- ItemChristianson000483 - Burlington Northern Diesel Locomotive 6594 at Saint Paul, Minnesota in 1981
- 155 more...