Railroad Archives Online
- FondsD0504b - Al Christianson Collection - Friends of the Burlington Northern Railroad
- Serie001 - Burlington Northern Railroad Company
- Teilserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
- ObjektChristianson000176 - Burlington Northern Caboose Number 10029 and Coal Hoppers at Saint Paul, Minnesota in 1980
- ObjektChristianson000177 - Burlington Northern Diesel Locomotives Number 1409, Number 1410 and Caboose Number 10214 at Daytons Bluff, Minnesota in 1981
- ObjektChristianson000178 - Burlington Northern Cabooses Number 10298, Number 12190 and Grain Hoppers at Minot, North Dakota in 1981
- ObjektChristianson000179 - Burlington Northern Cabooses Number 10298, Number 12190 and Grain Hoppers at Minot, North Dakota in 1981