The The Mt. Auburn or Main Street Incline was the first of the incline planes built to scale the rugged side of Mt. Auburn, heading directly north of the densely populated basin. It was built for passengers and was completed and started hauling passengers in 1872. In 1878, it was rebuilt with open platforms for horse cars. This incline was unique among the Cincinati inclines in that the grade was not the same all the way up. The bottom part was much steeper than the top. At top was the very popular Lookout House. In 1889 the incline was electrified and the system started to haul electric cars. The Main Street incline hauled cars up and down Mt. Auburn until 1898 when the section of the Cincinnati Inclined Plane Railway from downtown was sold to the Cincinnati Street Railway and Vine Street Hill became the route to town. observation cars that traveled the top so people could enjoy the view. Due to a inspection in 1921 the incline was closed to street cars and only passengers were taken up and down the incline.