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
- 315 more...
- ItemChristianson000161 - Burlington Northern Diesel Locomotive Number 993 at Breckenridge, Minnesota in 1981
- ItemChristianson000162 - Burlington Northern Diesel Locomotive Number 993 at Wyndmere, North Dakota in 1981
- ItemChristianson000163 - Burlington Northern Diesel Locomotive Number 993 at Breckenridge, Minnesota in 1981
- ItemChristianson000164 - Burlington Northern Diesel Locomotive Number 993 at Breckenridge, Minnesota in 1980
- ItemChristianson000165 - Burlington Northern Diesel Locomotive Number 993 at Wyndmere, North Dakota in 1981
- ItemChristianson000166 - Burlington Northern Diesel Locomotive Number 995 at Breckenridge, Minnesota in 1981
- ItemChristianson000167 - Burlington Northern Diesel Locomotive Number 995 at Breckenridge, Minnesota in 1981
- ItemChristianson000168 - Burlington Northern Diesel Locomotives Numbers 993 and 995 West of Oaks, North Dakota in 1981
- ItemChristianson000169 - Burlington Northern Diesel Locomotive Number 993 at Wyndmere, North Dakota in 1981
- 6 more...