and entrances Vehicular access to the bridge is provided by a complex series of ramps on both sides of the bridge. There are two entrances to the bridge's pedestrian promenade on either side. Rail traffic Formerly, rail traffic operated on the Brooklyn Bridge as well. Cable cars and elevated railroads used the bridge until 1944, while trolleys ran until 1950. Cable cars and elevated railroads The New York and Brooklyn Bridge Railway, a cable car service, began operating on September 25, 1883; it ran on the inner lanes of the bridge, between terminals at the Manhattan and Brooklyn ends. Since Washington Roebling believed that steam locomotives would put excessive loads upon the structure of the Brooklyn Bridge, the cable car line was designed as a steam/cable-hauled hybrid. They were powered from a generating station under the Brooklyn approach. The cable cars could not only regulate their speed on the % upward and downward approaches, but also maintain a constant interval between each other. There were 24 cable cars in total. Initially, the service ran with single-car trains, but patronage soon grew so much that by October 1883, two-car trains were in use. The line carried three million people in the first six months, nine million in 1884, and nearly 20 million in 1885 following the opening of the Brooklyn Union Elevated Railroad. Accordingly, the track layout was rearranged and more trains were ordered. At the same time, there were highly controversial plans to extend the elevated railroads onto the Brooklyn Bridge, under the pretext of extending the bridge itself. After disputes, the trustees agreed to build two elevated routes to the bridge on the Brooklyn side. Patronage continued to increase, and in 1888, the tracks were lengthened and even more cars were constructed to allow for four-car cable car trains. Electric wires for the trolleys were added by 1895, allowing for the potential future decommissioning of the steam/cable system. The terminals were rebuilt once more in July 1895, and, following the implementation of new electric cars in late 1896, the steam engines were dismantled and sold. Following the unification of the cities of New York and Brooklyn in 1898, the New York and Brooklyn Bridge Railway ceased to be a separate entity that June and the Brooklyn Rapid Transit Company (BRT) assumed control of the line. The BRT started running through-services of elevated trains, which ran from Park Row Terminal