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
- ItemChristianson000008 - Burlington Northern Diesel Locomotive Number 1 at Fargo, North Dakota in 1981
- ItemChristianson000009 - Burlington Northern Diesel Locomotive Number 101 and Precision National Diesel Locomotive Number 1832 in Saint Paul, Minnesota in 1980
- ItemChristianson000010 - Burlington Northern Diesel Locomotive Number 101 in Minneapolis, Minnesota in 1979
- ItemChristianson000011 - Burlington Northern Diesel Locomotive Number 108 in Minneapolis, Minnesota in 1979
- ItemChristianson000012 - Burlington Northern Diesel Locomotive Number 108 in Minneapolis, Minnesota in 1979
- ItemChristianson000013 - Burlington Northern Diesel Locomotive Number 109 in Fargo, North Dakota in 1981
- ItemChristianson000014 - Burlington Northern Diesel Locomotive Number 110 in Minneapolis, Minnesota in 1979
- ItemChristianson000015 - Burlington Northern Diesel Locomotive Number 110 in Minneapolis, Minnesota in 1979
- ItemChristianson000016 - Burlington Northern Diesel Locomotive Number 112 in Saint Paul, Minnesota in 1979
- 80 more...