. Official proceedings . rrrgiL company Ptcplct Ci> Building ■-j^O FF1C1AL PROCEEDINGS jC~\p. $l°?PerYear **$£? 25* PerCopy^ DECEMBER 23, 1926 No. 2 ICAR RETARDING SYSTEMS IN CONNECTION WITHTHE OPERATION OF HUMP YARDS. By MR. W. B. RUDD, Engineer, Union Switch & Signal Company, Swissvale, Pa. [ Steel Car Forge Company PITTSBURGH, PENNSYLVANIA FORGINGS

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