to connect the two halves, and tracks north on 11th Avenue to the West 23rd Street Ferry. When the Williamsburg Bridge opened in 1904, 14th Street cars were rerouted to use the bridge (running east on Delancey Street from the one-way pair of Clinton Street northbound and Essex Street southbound), running as the 14th Street-Williamsburg Bridge Line until 1911. Buses were substituted for streetcars by the New York City Omnibus Corporation on April 20, 1936. Avenue D service was added on January 28, 1951, initially running from Broadway along 14th Street, Avenue D and Columbia Street to Stanton Street, and returning on Cannon Street and Houston Street. That company changed its name to Fifth Avenue Coach Lines in 1956; the Manhattan and Bronx Surface Transit Operating Authority (MaBSTOA) subsidiary of the New York City Transit Authority took over operations in 1962. The route was once operated by the now defunct Hudson Pier Depot and was known only as the M14. When the depot was taken over by the Quill depot, it was separated into three lines, the M14A, M14C and M14D. After the 9/11 attacks, the block of 14th Street between Avenue C and Avenue D was closed to the public, forcing the M14D to run the M14C route, eventually it was decided since the route ran primarily on Avenue D the route would be renamed M14D. From 2004 to 2006, the M14C briefly returned running down Avenue C to Houston Street then turning East towards Avenue D/Columbia Street and resuming the normal route. This new route began running late and caused confusion with the M21 on Avenue C and eventually service returned to its current state as the M14A and M14D. Afterward, Avenue C was temporarily served by the M21 bus, but since 2010, it has been served by the M9 bus. Select Bus Service In April 2019, a Select Bus Service line was planned to run along 14th Street to provide alternate service during the original L train shutdown plan. Service was expected to operate from Ninth Avenue to Avenue C, then turn north along Avenue C to 20th Street, where there would be a ferry transfer. This route was to be another branch supplementing the existing M14A/D designation, but the existing lines would not be converted to Select Bus Service. To facilitate bus trips on the M14 corridor, the 14th Street busway would be implemented, turning parts