Railroad Archives Online
- CollectionD0504b - Al Christianson Collection - Friends of the Burlington Northern Railroad
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Railroad bridges(Draft)
- 8 more...
- ItemChristianson000342 - Burlington Northern diesel locomotives Number 1355, Number 717, Number 645 in Fergus Falls, Minnesota in 1980
- ItemChristianson000346 - Burlington Northern diesel locomotive Number 1413 in Saint Cloud, Minnesota in 1981
- ItemChristianson000336 - Burlington Northern Train 200 in Valley City, North Dakota in 1981
- ItemChristianson000337 - Burlington Northern Train 23 in Luverne, North Dakota in 1981
- ItemChristianson000338 - Burlington Northern Train 80 on Gassman Coulee bridge near Minot, North Dakota in 1981
- ItemChristianson000330 - Burlington Northern diesel locomotive Number 8141 in Valley City, North Dakota in 1981