N.Y. Railroad Law § 239: Trains to come to full stop

§ 239. Trains to come to full stop. All trains upon elevated railroads

shall come to a full stop before any passenger shall be permitted to

leave such trains; and no train on such railroad shall be permitted to

start until every passenger desiring to depart therefrom shall have left

the train, provided such passenger has manifested his intention to so

depart by moving toward or upon the platform of any car; nor until every

passenger upon the platform or station at which such train has stopped,

and desiring to board or enter such cars, shall have actually boarded or

entered the same, but no person shall be permitted to enter or board any

train after due notice from an authorized employee of such corporation

that such train is full and that no more passengers can be then

received.