shared operations to Coney Island. A connection and cross-platform interchange between the Brighton Beach and Franklin Avenue Lines was made at Prospect Park, where Franklin Avenue trains used the outer tracks and Brighton Beach trains used the inner tracks. South of Prospect Park, there are switches between all four tracks, allowing southbound trains from either line to run either local or express to Coney Island, as well as permitting northbound local and express trains from Coney Island to access either line. On the four-track Brighton Beach main line south of Prospect Park, the inner pair of tracks are for express trains, and the outer pair of tracks are for local trains. The line continued to operate elevated train service on the Brighton Beach main line until 1928, after which similar services were continued with steel subway cars. For the summer excursion season of 1924, the Franklin Avenue Line was upgraded for the operation of six-car subway trains, and was assigned the BMT number 7. This service used the Brighton Line during most daytime hours. During warm weather, express service ran to Coney Island on weekends during the day. In the 1920s, transportation officials discussed the possibility of an extension of the line. It was proposed that the line would be extended beyond Fulton Street, run across central Brooklyn, and link up with other BRT lines in Long Island City. Provisions for this line were made in the elevated structure at Queensboro Plaza, but no other parts of the line were built as the plan never left the talking stages. A crosstown line would eventually be built in the 1930s; however, it was part of the city-operated Independent Subway System, not the BRT. The Fulton Street Elevated, to which the Franklin Avenue line was originally connected, closed in 1940 and was replaced by the IND Fulton Street Line. A free transfer was instituted between the Fulton Street subway and the Franklin Avenue elevated. In 1958, a new switch was installed north of Prospect Park, allowing trains to reverse ends at the easternmost track at Prospect Park, which had formerly served northbound Franklin Avenue Line trains. This eliminated a traffic bottleneck in which southbound Franklin Avenue Line trains, arriving on the westernmost track at Prospect Park, reversed directions by crossing over two active Brighton Line tracks to the northbound Franklin Avenue Line track, thereby delaying train traffic. As a result, most trains