▁in ▁ 1 9 4 6 . ▁In ▁ 1 9 4 7 , ▁the ▁first ▁dies el ▁engine ▁was ▁operated ▁on ▁the ▁line . ▁ ▁The ▁US G ▁plant ▁at ▁Pl aster ▁City ▁is ▁currently ▁served ▁by ▁the ▁Union ▁Pacific ▁Rail road ▁( UP ). ▁ ▁Sign ific ant ▁events ▁ ▁Ant it rust ▁cases ▁C riminal ▁ ▁In ▁ 1 9 7 3 , ▁six ▁wall board ▁manufact ur ers ▁( including ▁US G ) ▁were ▁charged ▁with ▁viol ating ▁s . ▁ 1 ▁of ▁the ▁Sh erman ▁Act ▁during ▁the ▁period ▁ 1 9 6 0 1 9 7 3 , ▁through ▁eng aging ▁in ▁a ▁combination ▁and ▁consp i racy ▁in ▁rest raint ▁of ▁inter state ▁trade ▁and ▁commerce ▁in ▁the ▁manufact ure ▁and ▁sale ▁of ▁gy psum ▁board . ▁In ▁July ▁ 1 9 7 5 , ▁after ▁the ▁j ury ▁was ▁committed ▁to ▁deliber ate , ▁it ▁became ▁apparent ▁that ▁the ▁j ury ▁was ▁heading ▁for ▁a ▁dead lock . ▁Def ense ▁coun sel ▁moved ▁for ▁a ▁mist rial , ▁but ▁the ▁trial ▁judge ▁denied ▁the ▁request , ▁although ▁he ▁indicated ▁that , ▁if ▁no ▁ver dict ▁were ▁rendered ▁by ▁the ▁end ▁of ▁the ▁week , ▁he ▁would ▁then ▁re cons ider ▁the ▁mist rial ▁mot ions . ▁The ▁following ▁morning , ▁the ▁j ury ▁returned ▁guilty ▁ver dict s ▁against ▁each ▁of ▁the ▁defend ants . ▁ ▁The ▁Court ▁of ▁App e als ▁for ▁the ▁Third ▁Circ uit ▁revers ed ▁the ▁conv ict ions , ▁and