The left-side of Northern Pacific wood caboose 1314 in a yard at Sumas, Washington, on June 11, 1968. The car is part of the 1200-1399 number series. Photo by GJ Werkema. Other subject classes: freight car, wood caboose

Northern Pacific wood caboose 1740 on display at Boone, Iowa, on May 29, 1993. The car is part of the 1700-1789 number series. Photo by GJ Werkema. Other subject classes: freight car, wood caboose

Caboose NWP 37 at Tiburon, California, August 12, 1951. Photo taken by D.A. Strawn. Other Subject Classes: Caboose

Northwestern Pacific Railroad (NWP) caboose 6063 with switch engine at Tiburon, California, August 12, 1951, an overhead view. Photo taken by D.A. Strawn. Other Subject Classes: Caboose

Pacific Coast Caboose X1 in Renton, Washington, undated

Pacific Coast Caboose X1 in Seattle, Washington, circa 1952

Pacific Coast Caboose X1 in Seattle, Washington, circa 1952

Pacific Coast Caboose X1 in Seattle, Washington, circa 1952

Pacific Coast Caboose X1 in Seattle, Washington, circa 1952

Pacific Coast Caboose X1 in Seattle, Washington, circa 1952