Bush Terminal Railroad
The Bush Terminal Railroad was built to provide service to Bush Terminal tenants and was a key element of the integration of the facility. Sidings into all buildings from rail arteries running down the avenues allowed materials to be be directly transferred to and from rail cars, eliminating the difficulty and expense of transporting products to and from rail depots by truck at a time when rail transport was the primary mode of conveyance for all but the shortest distances. The railroad was linked to the rest of the country either by float bridges at 51st Street or the LIRR Bay Ridge Line at 65th Street. In its early years, the Bush Terminal took responsibility for rail freight transfer on the rail line, with the tenants only responsibility being to get their items to/from the transfer lobby via the freight elevators in all buildings.
The railyard was located just to the east of the terminal warehouses and occupies the six blocks between 44th and 50th streets. At its peak, the railyard could handle 1,000 cars.
The rail system also included smaller team track yards at 29th, 37th, 39th, 48th and 54th Streets. Such yards are so named because in an era before trucks, teamsters with wagons and teams of horses would come to such yards to load and unload railroad cars.
The New York Cross-Harbor Railroad was formed in 1983 to take over the underused facilities of the Brooklyn Terminal Railroad, Brooklyn Eastern District Terminal and the New York Dock. The facilities later came under the perview of the New York New Jersey Rail, providing rail carfloat connection between Greenville Yard in Jersey City, NJ and the Bush Terminal in Brooklyn.
As I was coming down 52nd Street on my first visit to the area in 2008, I saw a locomotive coming down the avenue but was not close enough to get a photo. Supposedly, such service occurs once a day or so and I did get photos of indentation in the mud around the lightly-used tracks.

Track entering the Bush Terminal

Track entering the Bush Terminal

Track entering the Bush Terminal - note the depression in the mud from the train that had just passed

Track leaving the Bush Terminal travelling south

Track running down First Avenue south to the Army Terminal

Track up the middle of First Avenue to the Bush Terminal

Spurs off the NYCH main track under queued municipal garbage trucks

RR crossing sign at Bush Terminal

Unused spur track in the mud

Unused gate that used to close spur connection on west side of First Avenue

Bush Terminal Warehouses no trespassing sign

Spurs running across sidewalk on west side of First Avenue

Tracks to 39th Street Terminal

Detail of unused spur junction on First Avenue

Detail of unused spur junction on First Avenue

Railroad crossing sign on 39th Street west of 2nd Avenue

Railroad crossing sign on 39th Street west of 2nd Avenue

4100 1st Avenue at 42nd Street (1927)

4100 1st Avenue at 42nd Street

Tracks behind engine house, btw 43rd and 42nd Streets west of 1st Avenue

Tracks on west side of 4100 1st Avenue

West side of 4100 1st Avenue

Tracks curving east off 1st Avenue down 41st Street

Tracks curving east off 1st Avenue down 41st Street

Tracks curving east off 1st Avenue down 41st Street

Tracks curving east off 1st Avenue down 41st Street

Tracks headed from the south up 1st Avenue

Active siding off 1st Avenue east on 40th Street

Active siding off 1st Avenue east on 40th Street

Active siding off 1st Avenue east on 40th Street

4014 1st Avenue btw 40th and 41st Streets

4014 1st Avenue btw 40th and 41st Streets

4014 1st Avenue btw 40th and 41st Streets