win ▁Lo comot ive ▁Works ▁of ▁Philadelphia , ▁the ▁Bald win ▁and ▁C . R . ▁Mason . ▁ ▁A ▁second ▁temporary ▁track ▁ ▁around ▁the ▁Brook sv ille ▁T unnel ▁and ▁a ▁third ▁ ▁around ▁Robert son ' s ▁h ollow ▁were ▁also ▁constructed . ▁ ▁The ▁temporary ▁tracks ▁successfully ▁joined ▁the ▁rail road ▁and ▁by ▁elimin ating ▁the ▁extra ▁cost ▁and ▁effort ▁of ▁removing ▁fre ight ▁and ▁passengers ▁from ▁trains ▁for ▁transport ▁over ▁the ▁mountains , ▁facil itated ▁further ▁growth ▁and ▁expansion ▁west ward . ▁ ▁Const ruction ▁continued ▁from ▁Sta un ton ▁through ▁a ▁water ▁gap ▁near ▁G os hen ▁at ▁Great ▁North ▁Mountain ▁by ▁ 1 8 5 5 , ▁and ▁had ▁reached ▁Mill bor o ▁by ▁ 1 8 5 6 . ▁ ▁This ▁western ▁section ▁of ▁the ▁line ▁included ▁an ▁additional ▁three ▁t unn els , ▁and ▁a ▁temporary ▁track ▁approximately ▁ ▁long ▁was ▁used ▁at ▁Mill bor o ▁while ▁the ▁tunnel ▁was ▁being ▁completed . ▁ ▁By ▁ 1 8 5 7 , ▁the ▁rail road ▁had ▁reached ▁a ▁point ▁known ▁as ▁Jackson ' s ▁River ▁Station , ▁at ▁the ▁foot ▁of ▁the ▁Al leg h any ▁Mountains . ▁ ▁This ▁location ▁would ▁later ▁be ▁known ▁as ▁Cl if ton ▁For ge ▁and ▁become ▁a ▁division ▁point ▁for ▁the ▁Ch es ape ake ▁and ▁Ohio ▁Railway . ▁ ▁The ▁temporary ▁track ▁over ▁Rock fish ▁G ap ▁was ▁used ▁until ▁the ▁Blue ▁R idge ▁T unnel ' s ▁opening ▁in ▁April ▁ 1 8 5 8 ,