Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemWerkema371 - Northern Pacific Slumber Coach passenger car in 1971.
- ItemWerkema372 - Northern Pacific Day/Nite Coach at Denver, Colorado, in 1971.
- ItemWerkema373 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- ItemWerkema374 - Northern Pacific coach 634 on the Lake Whatcom Railway at Park, Washington, in 1993.
- ItemWerkema375 - Northern Pacific coach 1372 in a train in 1960.
- ItemWerkema376 - Northern Pacific baggage car 1543 in a yard in 1982.
- ItemWerkema377 - Northern Pacific baggage car 1545 in 1960.
- ItemWerkema378 - Burlington Northern railway post office car 1931 in 1973.
- ItemWerkema379 - Northern Pacific Dinning car 451 at Richland, Washington, in 1981.
- 16 more...