1827 · Gravity Railway on Timber Trestle · Werk 357 von 1.871

Loaded coal cars running by gravity down the Mauch Chunk Switchback from Summit Hill to the Lehigh River: a string of small wooden coal wagons with a brakeman riding on them, the track laid on the timber trestle, mules riding in a following car on the trestle track, the wooded hillside dropping to the river.