▁two ▁tracks ▁fan ▁out ▁to ▁ 2 1 ▁tracks ▁just ▁west ▁of ▁P enn ▁Station . ▁ ▁Pro posed ▁Gate way ▁capacity ▁expansion ▁The ▁existing ▁North ▁River ▁T unn els ▁could ▁carry ▁a ▁maximum ▁of ▁ 2 4 ▁trains ▁per ▁hour ▁in ▁each ▁direction . ▁If ▁the ▁new ▁Hudson ▁T unnel ▁is ▁not ▁built , ▁the ▁North ▁River ▁T unn els ▁will ▁have ▁to ▁be ▁closed ▁one ▁at ▁a ▁time , ▁reducing ▁week day ▁service ▁below ▁the ▁existing ▁level ▁of ▁ 2 4 ▁trains ▁per ▁hour . ▁Due ▁to ▁the ▁need ▁to ▁provide ▁two - way ▁service ▁on ▁a ▁single ▁track , ▁service ▁would ▁be ▁reduced ▁by ▁over ▁ 5 0 ▁percent . ▁In ▁the ▁best - case ▁scenario , ▁with ▁perfect ▁operating ▁conditions , ▁ 9 ▁trains ▁per ▁hour ▁could ▁be ▁provided ▁through ▁the ▁existing ▁North ▁River ▁T unn els , ▁or ▁a ▁ 6 3 % ▁reduction ▁in ▁service . ▁During ▁the ▁duration ▁of ▁construction , ▁passengers ▁would ▁have ▁to ▁use ▁over c row ded ▁PATH ▁trains , ▁bus es , ▁and ▁fer ries ▁to ▁get ▁between ▁New ▁Jersey ▁and ▁New ▁York . ▁On ▁the ▁other ▁hand , ▁if ▁the ▁new ▁Gate way ▁tunnel ▁is ▁built , ▁it ▁would ▁allow ▁an ▁additional ▁ 2 4 ▁trains ▁per ▁hour ▁to ▁travel ▁under ▁the ▁Hudson ▁River , ▁supp lement ing ▁the ▁ 2 4 ▁trains ▁per ▁hour ▁that ▁could ▁use ▁the ▁existing ▁North ▁River ▁T ub es . ▁ ▁See ▁also ▁ ▁Ber gen ▁Hill ▁ ▁Ber gen ▁T unn els ▁ ▁East