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
- 307 more...
- ItemChristianson000153 - Burlington Northern Diesel Locomotive Number 990
- ItemChristianson000154 - Burlington Northern Diesel Locomotive Number 990 at Minneapolis, Minnesota in 1982
- ItemChristianson000155 - Burlington Northern Diesel Locomotive Number 990 at St. Cloud, Minnesota in 1981
- ItemChristianson000156 - Burlington Northern Diesel Locomotive Number 990 at Minneapolis, Minnesota in 1982
- ItemChristianson000157 - Burlington Northern Diesel Locomotive Number 992 at Breckenridge, Minnesota in 1980
- ItemChristianson000158 - Burlington Northern Diesel Locomotive Number 990 at St. Cloud, Minnesota in 1981
- ItemChristianson000159 - Burlington Northern Diesel Locomotive Number 992 at Wyndmere, North Dakota in 1981
- ItemChristianson000160 - Burlington Northern Diesel Locomotive Number 993 at Grand Forks, North Dakota in 1981
- ItemChristianson000161 - Burlington Northern Diesel Locomotive Number 993 at Breckenridge, Minnesota in 1981
- 14 more...