ConstanceR46: see personal email for attachments.
Went back as far as my copies of Army Corp of Engineers Port Facilities at Port of New York 1988, 1965, 1942,1932, 1913. No trackage shown.
But they had two 30 ton Diesel Clutch locomotive cranes (which are self propelled) built by Industrial Brownhoist and numerous Brookville locomotives and rail dollies for moving heavy material around.
But no railroad connections outside of the shipyard. No transfer bridges either, listed either ACoE Port Facilities or CoNY Department of Dock & Wharves.
Searched all my locomotive builders records:
Robins Dry Dock & Repair
Brookville 8T 4wDM BMD UD-6 - c/n 2648
Brookville 4w flatcar, 6' long - c/n 2649
Brookville 4w flatcar, 6' long - c/n 2650
Brookville 4w flatcar, 6' long - c/n 2651
Brookville 8T 4wDM BHA D00C - c/n 2697
Brookville 4w flatcar, 6' long - c/n 2698
Brookville 4w flatcar, 6' long - c/n 2699
Brookville 4w flatcar, 6' long - c/n2700
Todd Shipyard, Erie Basin Dry Docks
Brookville 4 w flatcar 9' 8" long 40t capacity c/n 2950
all above: standard gauge.
It appears the internal rail network was strictly for moving material around. Very common for large shipyards.
Industrial / Offline Terminal Railroad's of Brooklyn, Queens, Staten Island, Bronx & Manhattan