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
- 154 more...
- ItemChristianson000225 - Burlington Northern Diesel Locomotives Numbers 5812 and 5598 west of Mullen, Nebraska in 1981
- ItemChristianson000251 - Burlington Northern Diesel Locomotive Number 6252 and Two Precision Lease Engines at Dayton's Bluff, Minnesota, 1979
- ItemChristianson000252 - Burlington Northern Diesel Locomotive Number 6342 in Minneapolis, Minnesota, 1981
- ItemChristianson000253 - Burlington Northern Diesel Locomotives Number 6377, Number 6801, and Number 8162 in Fridley, Minnesota, 1981
- ItemChristianson000254 - Burlington Northern Diesel Locomotives Number 6383 and Number 6419, in Irving, Texas, 1979
- ItemChristianson000255 - Burlington Northern Diesel Locomotives Number 6394, Number 6483, and Number 8130 in Breckenridge, Minnesota, 1981
- ItemChristianson000256 - Burlington Northern Diesel Locomotives Number 6408 and Number 6763 in Saint Paul, Minnesota, 1980
- ItemChristianson000257 - Burlington Northern Diesel Locomotives Number 6491 and Number 6366 in Saint Paul, Minnesota, 1981
- ItemChristianson000258 - Burlington Northern Diesel Locomotive Number 6537, 1980
- 42 more...