§ 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.