Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3006 - Cabooses (Railroads)
- ItemWerkema359 - Burlington Northern steel caboose 10050 at Longmont, Colorado, in 1989.
- ItemWerkema360 - Burlington Northern steel caboose 10050 at Longmont, Colorado, in 1989.
- Itemimg195 - Burlington Northern Caboose 10167 at Sedro-Woolley, Washington, 1988
- Itemimg196 - Burlington Northern Caboose 10174 at Denver, Colorado, 1973
- Itemimg197 - Burlington Northern Caboose 10174 at Denver, Colorado, 1973
- Itemimg202 - Burlington Northern Caboose 10076 at Denver, Colorado, 1981
- Itemimg203 - Burlington Northern Caboose 10076 at Denver, Colorado, 1976
- 6 more...