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
- 165 more...
- 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
- ItemChristianson000266 - Burlington Northern Diesel Locomotives Number 6626 and Number 6324, Number 6625 and Number 6571 at Minneapolis, Minnesota, 1981
- ItemChristianson000267 - Burlington Northern Diesel Locomotives Number 6630 and Number 6833 at Minneapolis, Minnesota, 1980
- ItemChristianson000268 - Burlington Northern Diesel Locomotives Number 6707 and Number 6776 at Northtown, Minnesota, 1980
- ItemChristianson000269 - Burlington Northern Diesel Locomotives Number 6708 and Number 6754 at Newport, Minnesota, 1980
- 31 more...