Railroad Archives Online
- FondsD0036 - George Werkema Collection
- Cyfres004 - Northern Pacific Railroad Company
- Is-gyfres014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 004 - Railroad Passenger Cars
- EitemWerkema371 - Northern Pacific Slumber Coach passenger car in 1971.
- EitemWerkema372 - Northern Pacific Day/Nite Coach at Denver, Colorado, in 1971.
- EitemWerkema373 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- EitemWerkema374 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- EitemWerkema375 - Northern Pacific coach 1372 in a train in 1960.
- 20 mwy...