Lehigh Gorge Scenic Railway, Pennsylvania

An old postcard at Bear Creek (see map below) one notes the track nearest the river is at a lower level.

map from this website where there is an extensive pictorial history of the railways in the region

This heritage railway operates 16 miles (26 km) of the remaining trackage in this scenic winding river gorge from the town of Jim Thorpe (formerly called Mauch Chunk) to Old Penn Haven - tracks that used to be operated by the Central Railroad of New Jersey (CNJ) and the Lehigh Valley Railroad (LV). website