Black and white lantern slide of five men at the front of a train engine turning it manually.

Black and white lantern slide of people waiting on a railroad platform to baord a train in Yucatan, Mexico.

Black and white photograph of a New York City tunnel through rock along the Hudson River.

Black and white photograph of rocky landscape and train in motion on railroad tracks. Two engines and two passenger cars, all connected, are visible to the right of the photograph.

Black and white photograph of rocks to the east of a summit. Railroad tracks can be seen through the rocky landscape.

Black and white photograph of rocks at Point Sublime, taken by Robert Merrill from a stationary train.

Black and white photograph of a landslide on the Chicago, Rock Island and Pacific Railroad. Taken by Robert Merrill from a moving train.

Black and white lantern slide of a railroad bridge entrance. A sign on top of the bridge reads "Erbaut 1909-1912, Maschinenfabrik Augsburg-Nurnberg A.C. Werk Gustavsberg."

Black and white lantern slide of a railroad bridge crossing the Yellow River in China.

Black and white lantern slide of a railroad bridge taken from below.

Black and white photograph of railway tracks going up a mountainside. A bridge over the tracks is visible.

Black and white photograph of railway tracks going up a mountainside.