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
- 225 more...
- ItemChristianson000121 - Burlington Northern Diesel Locomotives 794 and 645 at Wahpeton, North Dakota in 1980
- ItemChristianson000122 - Burlington Northern train crossing the trestle at Valley City, North Dakota in 1981
- ItemChristianson000123 - Burlington Northern Diesel Locomotive 832 at Tilden Junction, Minnesota in 1981
- ItemChristianson000124 - Burlington Northern Diesel Locomotives 834 and 788 at Minneapolis, Minnesota in 1981
- ItemChristianson000125 - Burlington Northern Diesel Locomotive 986 at Minneapolis, Minnesota in 1980
- ItemChristianson000276 - Burlington Northern Diesel Locomotive Number 6729 at Saint Paul, Minnesota in 1980
- ItemChristianson000277 - Burlington Northern Diesel Locomotive Number 6729 at Saint Paul, Minnesota in 1980
- ItemChristianson000278 - Burlington Northern Diesel Locomotives Numbers 6731, 6739, and 7842 at Saint Cloud, Minnesota in 1981
- ItemChristianson000279 - Burlington Northern Diesel Locomotive Number 6742 at Saint Paul, Minnesota in 1980
- 325 more...