Courtesy of Scott Tanner.
The bridge over the Columbia River near Rock Island took some time to build, so for a while a ferry moved trains across the river up near where the railroad yard is in Wenatchee. The bridge was completed in the 1892 and ran that way for years until the Great Northern was getting some truly heavy steam locomotives in 1925 and needed to upgrade the bridge. Instead of rerouting traffic over a competing line, or building another bridge, they simply built a new bridge around the current bridge, making this one of the most unique bridges in service today. This view, shows what it looked like up until 1925.
The two images were from a stereoscopic print made of the bridge.