Pennsylvania Railroad Class E3sd

The Pennsylvania Railroad's class E3sd steam locomotives were of the 4-4-2 "Atlantic" passenger type, frequently called light Atlantics after the introduction of the heavier E6 Atlantics. All were similar in size and boiler capacity but differed in firebox type, valves and valve gear and cylinder diameter. Class E3 were built simultaneously. Starting in 1916 a rebuilding program converted ninety class E2a,b,c to class E7s by replacing slide valves with piston valves and increasing cylinder diameter from 20.5 to 22.5 inches (520 to 570 mm). Fourteen class E2 were similarly converted to class E7sa. Ninety class E2a,d, were converted to class E3sd. These improvements allowed many of the engines to remain in active service into the 1950s.
Category:4-4-2 locomotives
Category:Pennsylvania locomotives
Category:Tender locomotives
Category:4-4-2 steam locomotives
Category:Passenger locomotives
Category:Standard gauge locomotives
Category:American locomotives
Category:American steam locomotives
Category:Steam locomotives
Category:Locomotives