The Mauch Chunk Switchback Railway, also known as the Mauch Chunk and Summit Railroad and occasionally shortened to Mauch Chunk Railway, was a coal-hauling railroad in the mountains of Pennsylvania that was built in 1827 and operated until 1932. It was the second gravity railway constructed in the United States, which was used by the Lehigh Coal & Navigation Company to transport coal from Summit Hill downhill to the Lehigh canal.