On December 16, 1914, Charles Francis Jenkins (a prolific inventor) filed a patent for Gravity-railway device, that allows a railway car carrying minerals or passengers to coast down the slope by the force of gravity alone.
Charles Francis Jenkins was granted over 400 patents related to a variety of inventions.
Publication number: US1216694 A
Patent Title: Gravity-railway device
Publication type: Grant
Publication date: 20 Feb 1917
Filing date: 16 Dec 1914
Priority date: 16 Dec 1914
Inventors: Charles Francis Jenkins
Original Assignee: Charles Francis Jenkins