▁with ▁the ▁mer ger ▁of ▁three ▁companies ▁( P neum atic ▁Sign al ▁Company ▁of ▁Ro chester , ▁New ▁York , ▁Taylor ▁Sign al ▁Co . ▁of ▁Buff alo , ▁New ▁York ▁and ▁Standard ▁Rail road ▁Sign al ▁Company ▁of ▁Ar ling ton , ▁New ▁Jersey ). ▁In ▁ 1 9 2 3 ▁G RS ▁acquired ▁the ▁Federal ▁Sign al ▁Company ▁of ▁Alb any , ▁New ▁York . ▁ ▁General ▁Railway ▁Sign al ▁was ▁one ▁of ▁the ▁ 3 0 ▁stock s ▁when ▁the ▁Dow ▁Jones ▁Indust rial ▁A verage ▁was ▁expanded ▁from ▁a ▁ 2 0 - stock ▁average ▁on ▁October ▁ 1 , ▁ 1 9 2 8 . ▁It ▁was ▁replaced ▁in ▁the ▁DJ IA ▁by ▁Lig get t ▁& ▁My ers ▁on ▁July ▁ 1 8 , ▁ 1 9 3 0 . ▁In ▁ 1 9 6 5 , ▁General ▁Sign al ▁Corporation ▁( GS X ) ▁was ▁created ▁with ▁the ▁intent ▁to ▁divers ify ▁into ▁areas ▁other ▁than ▁railway ▁signal ing . ▁G RS ▁was ▁a ▁wh olly ▁owned ▁subs idi ary ▁of ▁G S X . ▁ ▁In ▁ 1 9 6 0 , ▁G RS ▁opened ▁the ▁" General ▁Railway ▁Sign al ▁Company ▁de ▁Argentina " ▁( GR SA ) ▁division ▁in ▁Buenos ▁Aires , ▁which ▁provided ▁manufact ure , ▁installation ▁and ▁technical ▁support ▁of ▁G RS ▁rail road ▁sign alling ▁systems ▁in ▁Argentina . ▁Some ▁local ▁rail road ▁lines ▁that ▁were ▁provided ▁with ▁GR SA ▁products ▁were ▁Bel gr ano ▁Norte , ▁Bel gr