. ▁ ▁Ex cept ▁for ▁a ▁curve ▁west ▁of ▁the ▁west ▁end ▁of ▁Pier ▁ 7 2 ▁that ▁tot als ▁just ▁under ▁a ▁degree , ▁the ▁two ▁tracks ▁are ▁straight ▁( in ▁plan ▁view ). ▁They ▁are ▁ ▁apart ▁from ▁west ▁of ▁ 1 1 th ▁Avenue ▁to ▁the ▁Ber gen ▁Hill ▁port als . ▁The ▁third ▁rail ▁now ▁ends ▁just ▁west ▁of ▁the ▁Ber gen ▁Hill ▁port als . ▁ ▁Operation ▁and ▁useful ▁life ▁The ▁current ▁North ▁River ▁T unn els ▁allow ▁a ▁maximum ▁of ▁ 2 4 ▁one - way ▁cross ings ▁per ▁hour . ▁Since ▁ 2 0 0 3 , ▁the ▁t unn els ▁have ▁operated ▁near ▁capacity ▁during ▁peak ▁hours . ▁Between ▁ 1 9 7 6 ▁and ▁ 2 0 1 0 , ▁the ▁number ▁of ▁N J ▁Trans it ▁week day ▁trains ▁crossing ▁the ▁Hudson ▁using ▁the ▁North ▁River ▁T unn els ▁increased ▁from ▁ 1 4 7 ▁to ▁ 4 3 8 . ▁ ▁Tra ins ▁ordin arily ▁travel ▁west ▁( to ▁New ▁Jersey ) ▁through ▁the ▁north ▁t ube ▁and ▁east ▁( to ▁Manh attan ) ▁through ▁the ▁south . ▁During ▁the ▁bus iest ▁hour ▁of ▁morning ▁r ush , ▁about ▁ 2 4 ▁trains ▁are ▁scheduled ▁through ▁the ▁south ▁t ube , ▁and ▁the ▁same ▁through ▁the ▁north ▁t ube ▁in ▁the ▁afternoon . ▁ ▁The ▁tub es ▁run ▁parallel ▁to ▁each ▁other ▁under ne ath ▁the ▁river . ▁The ▁center ▁of ▁each ▁t ube ▁was ▁separated ▁by ▁a ▁distance ▁of ▁. ▁The