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
- 42 more...
- ItemChristianson000075 - Burlington Northern diesel locomotive Number 540 at Burlington, Iowa in 1982
- ItemChristianson000076 - Burlington Northern diesel locomotive Number 540 at Burlington, Iowa in 1982
- ItemChristianson000077 - Burlington Northern diesel locomotive Number 575 at Omaha, Nebraska in 1979
- ItemChristianson000078 - Burlington Northern diesel locomotive Number 575 at Council Bluffs, Iowa in 1975
- ItemChristianson000079 - Burlington Northern diesel locomotive Number 577 at Omaha, Nebraska in 1979
- ItemChristianson000080 - Burlington Northern diesel locomotive Number 577 at Omaha, Nebraska in 1979
- ItemChristianson000081 - Burlington Northern diesel locomotive Number 578 at Fremont, Nebraska in 1981
- ItemChristianson000082 - Burlington Northern diesel locomotive Number 578 at Fremont, Nebraska in 1981
- ItemChristianson000083 - Burlington Northern diesel locomotive Number 583 at Omaha, Nebraska in 1979
- 38 more...