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
- 161 more...
- ItemChristianson000257 - Burlington Northern Diesel Locomotives Number 6491 and Number 6366 in Saint Paul, Minnesota, 1981
- ItemChristianson000258 - Burlington Northern Diesel Locomotive Number 6537, 1980
- ItemChristianson000259 - Burlington Northern Diesel Locomotives Number 6547, Number 6557 and Number 8147 in Dilworth, Minnesota, 1981
- ItemChristianson000260 - Burlington Northern Diesel Locomotives Number 6560, and Number 6403 at Dayton's Bluff, Minnesota, 1981
- ItemChristianson000261 - Burlington Northern Diesel Locomotive Number 6613 at Northtown, Minnesota, 1981
- ItemChristianson000262 - Burlington Northern Diesel Locomotive Number 6615, 1981
- ItemChristianson000263 - Burlington Northern Diesel Locomotives Number 6617 and Number 7889 at Minneapolis, Minnesota, 1980
- ItemChristianson000264 - Burlington Northern Diesel Locomotives Number 6617 and Number 7889 at Minneapolis, Minnesota, 1980
- ItemChristianson000265 - Burlington Northern Diesel Locomotives Number 6621 and Number 6808 in Saint Paul, Minnesota, 1980
- 35 more...