I have not been to the corner of Church Avenue and McDonald recently. However, let's consider the route of the McDonald Avenue car line from Coney Island in the 1940's. It left the shed on Surf Avenue (the shed containing a carousel) and went north on unkempt private right of way that paralleled the Culver el structure. At some point, the route moved under the el, into the center of McDonald Avenue. At Coney Island shops, the South Brooklyn freight moves joined it. For much of the trip north, if memory is correct, the tracks were open, not in pavement. When the Culver el swung west , the South Brooklyn also left McDonald Avenue and headed for the area adjacent to the 9th Avenue station and the continuing route to docklands. The McDonald Avenue PCC's continued north alongside the portal later to be used by the Independent Culver routing. At Church Avenue and McDonald, therefore, there were no South Brooklyn freight movements. Sometimes, we would see a Gravesend-Church car turn from McDonald Avenue to Church Avenue.
Bus B69 now serves the Vanderbilt Avenue portion of the McDonald-Vanderbilt PCC combo.
Bus B67 replaces the Seventh Avenue PCC route, but its southern end has been extended to McDonald Avenue and Cortelyou Road, Kensington.
South of that, the passenger must climb stairs to the F Culver train to reach Coney Island.