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
- 389 more...
- ItemChristianson000444 - Burlington Northern diesel locomotive 6217 at Golden, Colorado in 1981
- ItemChristianson000445 - Burlington Northern diesel locomotive 6218 at Denver, Colorado in 1981
- ItemChristianson000446 - Burlington Northern diesel locomotive 6228 at Denver, Colorado in 1981
- ItemChristianson000447 - Burlington Northern diesel locomotive 6234 at Golden, Colorado in 1981
- ItemChristianson000448 - Burlington Northern diesel locomotive 6243 at Minneapolis, Minnesota in 1981
- ItemChristianson000449 - Burlington Northern diesel locomotive 6247 at Minneapolis, Minnesota in 1981
- ItemChristianson000450 - Burlington Northern diesel locomotive 6253 at Minneapolis, Minnesota in 1977
- ItemChristianson000476 - Burlington Northern Diesel Locomotive 6475 at Saint Paul, Minnesota in 1980
- ItemChristianson000477 - Burlington Northern Diesel Locomotive 6502 at Minneapolis, Minnesota in 1981
- 161 more...