The KCERR connection was still less than ideal, and the Brooklyn Rapid Transit company, which ended up as the lessor of both the KCERR and B&BB roads, negotiated a more direct subway route under Flatbush Avenue as part of Contract 4 of the Dual Contracts of 1913.
On August 1, 1920, the Brighton Beach Line was connected to the BMT Broadway Line subway via a connection under Flatbush Avenue, and at the same time track connections to the Fulton Street El were severed so that through service to Brooklyn Bridge is no longer possible.