Burlington Northern signal bridge at Pasco, Washington, on June 26, 1986.This former Northern Pacific structure is in their 2nd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: signal, Signal Bridge.

Burlington Northern signal bridge at Pasco, Washington, on June 26, 1986.This former Northern Pacific structure is in their 2nd subdivision of the Idaho division. Photo by GJ WerkemaOther subject classes: signal, Signal Bridge.

Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, on May 17, 2003. This former Northern Pacific structure is in their 1st subdivision of the Fargo division. Photo by GJ Werkema. Subject Classes: bridge, viaduct

Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, on May 17, 2003. This former Northern Pacific structure is in their 1st subdivision of the Fargo division. Photo by GJ Werkema. Subject Classes: bridge, viaduct

Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, on May 17, 2003. This former Northern Pacific structure is in their 1st subdivision of the Fargo division. Photo by GJ Werkema. Subject Classes: bridge, viaduct

Burlington Northern semaphore signals at Glade, Washington, on June 25, 1986. These former Northern Pacific signals are in the 2nd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: Signal, Semaphores.

Burlington Northern semaphore signals at Glade, Washington, on June 25, 1986. These former Northern Pacific signals are in the 2nd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: Signal, Semaphores.

Burlington Northern semaphore signals at Gibbon, Washington, on June 26, 1986. These former Northern Pacific signals are in the 3rd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: Signal, Semaphores.

Burlington Northern semaphore signals at Gibbon, Washington, on June 26, 1986. These former Northern Pacific signals are in the 3rd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: Signal, Semaphores.

Burlington Northern semaphore signals at Eltopia, Washington, on June 25, 1986. These former Northern Pacific signals are in the 2nd subdivision of the Idaho division. Photo by GJ Werkema. Other subject classes: Signal, Semaphores.