is it used for rail traffic as well?
Yes - it has two elevated railway tracks
Rail tracks
In addition to the two elevated railway tracks, the bridge also had four streetcar tracks. The following Queens lines operated over the bridge:
how much is robert f kennedy bridge toll drivers pay $9.50 per car or $4.00 per motorcycle for tolls by mail. Customer Service Center pay $6.12 per car or $2.66 per motorcycle. which locations are connected by this bridge? The bridges link the boroughs of Manhattan, Queens, and the Bronx. does it traverse a river? Yes -  East River, Harlem River, Bronx Kill where does the first river originate? Long Island Sound are there any other bridges on that river? Yes -  Brooklyn Bridge, Williamsburg Bridge, the Queensboro Bridge what type of bridge is the first one? cable-stayed/suspension bridge what types of vehicles use it? Only passenger vehicles and pedestrian and bicycle traffic are permitted. is the second bridge also same type as the first one? No - The Williamsburg Bridge is a suspension bridge how many levels does the third bridge have? 2 - upper level ,  lower level
Yes, in addition to the two elevated railway tracks, the bridge also had four streetcar tracks. Yes. Yes it has two elevated railway tracks
Queensboro Bridge Queensboro Bridge Queensboro Bridge
Rail tracks Rail tracks Rail tracks
In addition to the two elevated railway tracks, the bridge also had four streetcar tracks. In addition to the two elevated railway tracks, the bridge also had four streetcar tracks.  n addition to the two elevated railway tracks, the bridge also had four streetcar tracks. The following Queens lines operated over the bridge:
wiki:5318777
Queensboro Bridge [SEP] Rail tracks
In addition to the two elevated railway tracks, the bridge also had four streetcar tracks. The following Queens lines operated over the bridge: One Manhattan line operated over the bridge, the Third Avenue Railway's 42nd Street Crosstown Line from 1910 to 1950.