By the late-1910s many trolley systems began to decline, but rather than collapse or sell themselves to other companies, the NY&NST replaced their trolley cars with buses, the majority of which operated in Queens. The economic impact of the Great Depression forced them to sell off many of their routes to other companies during the 1930s, most notably to the Triboro Coach Corporation, one of the last surviving private bus lines in New York City. In spite of this, the company was still occasionally able to purchase routes from Bee Line, Incorporated in Nassau County. North Shore acquired the Flushing Heights Bus Corporation and its and routes on September 22, 1935, although that company was never merged into NSB. On June 25, 1939, North Shore acquired the remaining Bee Line routes and Bee Line's 165th Street Bus Terminal in Jamaica, as part of the company's takeover of nearly all routes in Zone D (Jamaica and Southeast Queens). By the 1940s, North Shore operated nearly all the bus routes in Zone B (Flushing and Northern Queens) and Zone D. On March 30, 1947 the company went bankrupt after its drivers and other employees went on strike. Its operations were taken over by the New York City Board of Transportation, which was superseded by the New York City Transit Authority in 1953. Prior to takeover by the city in 1947, the company based its operations out of two depots:  The Flushing Depot of the company was located on the south side of Roosevelt Avenue in Flushing Meadows-Corona Park in Queens, west of 126th Street and east of the New York City Subway's Corona Yard. This depot opened sometime in the 1900s, and housed buses serving northern Queens. It is now the Casey Stengel Depot under the MTA. The company's Jamaica Depot was located on the west side of Merrick Boulevard just south of Liberty Avenue in Jamaica, Queens. The depot lies between Merrick Boulevard to the east and 165th Street to the west, and spans about three blocks north-to-south between South Road and 107th Avenue, located across the campus of York College. This depot, which housed buses serving the Jamaica and Southeastern Queens area, opened in 1939, and expanded in subsequent years following takeover, adding bus storage areas and a washing area. It is now the Jamaica Depot under the MTA. For many years after the takeover, both of the depots were overcrowded with buses due to lack of storage space. In 1968, the MTA, which now ran the NYCTA, acquired land to build another depot, the Queens Village Depot, to relieve crowding at the other two depots.