▁vest ib ule ▁steps , ▁and ▁t rol ley ▁pol es ▁were ▁later ▁removed ▁and ▁head light s ▁re located ▁to ▁below ▁the ▁wind sh ield ▁to ▁make ▁them ▁more ▁aer od ynamic ▁and ▁their ▁mot ors ▁were ▁re w ired ▁from ▁, ▁increasing ▁their ▁top ▁speed ▁from ▁, ▁making ▁them ▁easier ▁to ▁keep ▁up ▁with ▁the ▁newer ▁Bul let ▁trains . ▁ ▁By ▁this ▁time ▁the ▁overhead ▁wire ▁in ▁the ▁car bar n ▁area ▁was ▁replaced ▁with ▁extension ▁wire ▁which ▁attached ▁to ▁the ▁third ▁rail ▁sho es ▁to ▁move ▁the ▁M U ▁equipment . ▁ ▁Three ▁other ▁Stra ff ord - type ▁cars , ▁called ▁the ▁ 5 0 - series , ▁were ▁purchased ▁from ▁Br ill ▁in ▁ 1 9 2 0 . ▁ ▁They ▁were ▁wider ▁and ▁longer ▁than ▁the ▁later ▁Stra ff ords ▁and ▁never ▁had ▁vest ib ule ▁steps . ▁ ▁They ▁were ▁never ▁re built , ▁so ▁with ▁their ▁top ▁speed ▁still ▁only ▁, ▁they ▁had ▁to ▁be ▁used ▁strictly ▁in ▁r ush ▁hour ▁short - turn ▁service ▁so ▁they ▁wouldn ' t ▁get ▁in ▁the ▁way ▁of ▁the ▁other ▁much ▁faster ▁trains . ▁ ▁They ▁were ▁finally ▁scra pped ▁in ▁ 1 9 5 2 . ▁ ▁Many , ▁widely ▁varied ▁propos als ▁were ▁made ▁to ▁get ▁new ▁equipment ▁for ▁the ▁P & W ▁line ▁but ▁were ▁never ▁carried ▁out . ▁In ▁ 1 9 4 8 , ▁St . ▁Louis ▁Car ▁Co . ▁offered ▁a ▁proposal ▁for ▁new ▁cars ▁of ▁a ▁double - ended ▁P