1911 thru 1917 70 ton H21a "quad" hoppers were introduced for coal service.
During 1922 and 1923 all early H21 hoppers were converted to H21a's by replacing
the 50 ton trucks with 70 ton trucks equipping them for coal service and
bringing the total to 36,000 H21a hopper cars. The original 1909 thru 1930 quad
hoppers were built with the "old style" double door hopper. During the 1930's
and early 1940's all old style double-door hoppers were replaced with the "saw
tooth" hopper, increasing capacity by 39 to 40 cubic feet making them easier to
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