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
- 232 more...
- 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
- ItemChristianson000280 - Burlington Northern Diesel Locomotives Numbers 6742 and 3045 at Saint Paul, Minnesota in 1980
- ItemChristianson000281 - Burlington Northern Diesel Locomotives Numbers 6747 and, 7900 at Saint Paul, Minnesota in 1980
- ItemChristianson000282 - Burlington Northern Diesel Locomotives Numbers 6759 and, 6770 at Dayton's Bluff, Minnesota in 1980
- ItemChristianson000283 - Burlington Northern Diesel Locomotives Numbers 6770 and, 7887 at Staples, Minnesota in 1981
- ItemChristianson000284 - Burlington Northern Diesel Locomotives Numbers 6771 and, 6703 at Saint Paul, Minnesota in 1981
- ItemChristianson000285 - Burlington Northern Diesel Locomotives Numbers 6780 and, 7843 at Breckenridge, Minnesota in 1980
- ItemChristianson000286 - Burlington Northern Diesel Locomotives Numbers 6792, 6726 and 6717 at Saint Paul, Minnesota in 1981
- 89 more...