▁H aven ▁Line ' s ▁Dan bury ▁and ▁Water bury ▁branches . ▁They ▁are ▁typically ▁operated ▁in ▁a ▁push - pull ▁configuration . ▁ ▁Hudson ▁Line ▁Sh or elin ers ▁are ▁used ▁in ▁the ▁non - elect r ified ▁territory ▁north ▁of ▁Cro ton - H arm on . ▁Tra ins ▁often ▁operate ▁to ▁and ▁from ▁Grand ▁Central ▁Terminal ▁and ▁ ▁P ough ke eps ie ▁and ▁running ▁express ▁south ▁of ▁Cro ton - H arm on , ▁along ▁with ▁two ▁daily ▁late ▁night ▁sh utt le ▁trains ▁running ▁in ▁the ▁non - elect r ified ▁territory , ▁one ▁in ▁each ▁direction . ▁ ▁Har lem ▁Line ▁Sh or elin ers ▁are ▁used ▁in ▁the ▁non - elect r ified ▁territory ▁north ▁of ▁S out heast . ▁Service ▁between ▁S out heast ▁and ▁W assa ic ▁is ▁mostly ▁operated ▁using ▁two - or - three - car ▁sh utt le ▁trains . ▁During ▁r ush ▁hour , ▁a ▁few ▁trains ▁run ▁direct ▁to ▁Grand ▁Central ▁Terminal . ▁ ▁New ▁H aven ▁Line ▁branches ▁Sh or elin ers ▁operate ▁on ▁the ▁Dan bury ▁and ▁Water bury ▁branches , ▁as ▁well ▁as ▁to ▁provide ▁extra ▁service ▁on ▁the ▁main ▁line ▁during ▁the ▁day . ▁Dan bury ▁service ▁includes ▁limited ▁through - service ▁to ▁Grand ▁Central ▁during ▁peak ▁periods , ▁while ▁off - pe ak ▁Dan bury ▁and ▁all ▁Water bury ▁service ▁oper ates ▁as ▁sh utt les ▁from ▁South ▁Nor walk ▁and ▁Bridge port . ▁ ▁Form er ▁Sh ore ▁Line ▁East ▁Service ▁Before ▁the