 For many years trains had to be hauled by cable, originally driven by a stationary steam engine.A few months later haulage by cable attached to a stationary steam engine was changed to haulage by cable attached via pulleys to a locomotive running downhill on an additional track.With the duplication of the remainder of the line in 1865, the steep section of line became three-track, until the electrification of the line in 1963.