Around the same time, Gravesend was the site of testing for the Boynton Bicycle Railroad, the earliest forerunner of the monorail. The BBR consisted of a single-wheeled engine that hauled two double-decker passenger cars along a single track; a second rail above the train, supported by wooden arches, kept it from tipping over. The engine and cars were four feet wide and were capable of speeds far greater than the much bulkier standard trains. In 1889, the BBR began running a short route between the Gravesend stop of the Sea Beach Railroad (near the intersection of 86th and West Seventh Streets) and Brighton Beach in Coney Island, a distance of just over a mile. Despite the smooth and speedy ride, the BBR ultimately failed and the test route fell into disuse, as did the Boynton train and its shed.