IRT - Harlem River Second Avenue Bridge
Photo from old postcard
BH Photo #511573
This bridge was open after 1942, at least until 1955. Although the Second Avenue el was abandoned/closed north of 57th St. in June 1940 (the southern portion and Queensboro Bridge tracks closed in June 1942), the Second Ave. Bridge was still used by the Third Avenue El.
Expresses ran on the upper level, and locals on the lower level. The Third Ave. El closed south of 149th St. in 1955, so the bridge would have been removed sometime after that.