, ▁ 2 - stroke ▁dies el ▁engines ▁especially ▁for ▁rail ▁tra ction ▁ ▁William ▁K . ▁Mac Cur dy , ▁developed ▁the ▁H yd ra - C ush ion ▁in ▁ 1 9 5 4 ▁to ▁ease ▁stress ▁on ▁fre ight ▁cars ▁for ▁Southern ▁Pacific ▁ ▁Syl v ester ▁Marsh , ▁first ▁mountain ▁railway ▁in ▁the ▁world ▁with ▁a ▁ra ck ▁system ▁ ▁William ▁Nor ris , ▁founded ▁the ▁Nor ris ▁Lo comot ive ▁Works ▁and ▁pione ered ▁the ▁use ▁of ▁the ▁ 4 - 2 - 0 ▁( N or ris ▁type ) ▁locomot ive ▁in ▁America ▁during ▁the ▁ 1 8 4 0 s ▁ ▁George ▁Mort imer ▁P ull man , ▁P ull man ▁Palace ▁Car ▁Company ▁ ▁William ▁Robinson , ▁invent or ▁of ▁the ▁track ▁circuit ▁ ▁Thomas ▁Rog ers , ▁mechanical ▁engineer ▁and ▁founder ▁of ▁Rog ers ▁Lo comot ive ▁and ▁Machine ▁Works ▁of ▁Pat erson , ▁New ▁Jersey ▁ ▁E ph ra im ▁Sh ay , ▁invent or ▁of ▁the ▁Sh ay ▁locomot ive ▁ ▁Frank ▁Julian ▁Sp rag ue , ▁" F ather ▁of ▁electric ▁tra ction " ▁in ▁the ▁US , ▁tram way , ▁train ▁safety ▁system ▁ ▁Robert ▁L . ▁Stevens , ▁invent or ▁of ▁the ▁Fl anged ▁T ▁rail ▁ ▁George ▁S . ▁Str ong , ▁introduced ▁new ▁locomot ives ▁types ▁in ▁American ▁much ▁in ▁advance ▁of ▁their ▁time ▁ ▁Samuel ▁M . ▁V auc lain , ▁Bald win ▁Lo comot ive ▁Works , ▁pat ented ▁the ▁V auc lain ▁comp ound