The Pennsylvania Railroad’s class E2 E3 E7 steam locomotives were of the 4-4-2 Atlantic passenger type frequently called “light Atlantics” after the introduction of the heavier more powerful E6 Atlantics. All locomotives were similar in terms of wheel configuration and size boiler capacity but differed in firebox type valves and valve gear and cylinder diameter. Classes E2 and E3 were built simultaneously rather than consecutively.
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