▁construct ▁the ▁line ▁on ▁January ▁ 1 3 , ▁ 1 9 1 6 . ▁Cl iff ord ▁Mil burn ▁Holland ▁served ▁as ▁the ▁engineer - in - charge ▁during ▁the ▁construction . ▁ ▁On ▁June ▁ 3 0 , ▁ 1 9 2 4 , ▁at ▁what ▁is ▁now ▁the ▁other ▁end ▁of ▁the ▁line , ▁a ▁sub way ▁line ▁initially ▁known ▁as ▁the ▁ 1 4 th ▁Street – E astern ▁District ▁Line , ▁usually ▁short ened ▁to ▁ 1 4 th ▁Street – E astern ▁Line , ▁was ▁opened ▁running ▁beneath ▁ 1 4 th ▁Street ▁in ▁Manh attan , ▁from ▁Six th ▁Avenue ▁under ▁the ▁East ▁River ▁and ▁through ▁Williams burg ▁to ▁Mont rose ▁and ▁Bush wick ▁Aven ues . ▁In ▁ 1 9 2 4 , ▁a ▁temporary ▁connection ▁was ▁built ▁from ▁the ▁Long ▁Island ▁Rail ▁Road ' s ▁Bush wick ▁Y ard ▁that ▁ran ▁via ▁Mont rose ▁Avenue ▁and ▁then ▁connected ▁to ▁the ▁B MT ▁Can ars ie ▁Line ▁under ▁Bush wick ▁Avenue ▁just ▁near ▁the ▁Mont rose ▁Avenue ▁station . ▁This ▁was ▁done ▁in ▁order ▁for ▁the ▁delivery ▁of ▁new ▁B MT ▁Standard ▁sub way ▁cars ▁for ▁the ▁then ▁isolated ▁Can ars ie ▁Line ▁of ▁the ▁New ▁York ▁City ▁Sub way . ▁The ▁first ▁of ▁the ▁cars ▁were ▁delivered ▁by ▁this ▁r amp ▁on ▁June ▁ 1 8 , ▁ 1 9 2 4 . ▁ ▁Four ▁years ▁later , ▁on ▁July ▁ 1 4 , ▁ 1 9 2 8 , ▁the ▁line ▁was ▁extended