New Jersey Statutes Title 48. Public Utilities 48 § 12-103

Any railroad company may, subject to the approval of the Board of Public Utility Commissioners, collect such extra fare from passengers who travel in cars furnished in a superior manner and with extra accommodations, commonly known as parlor or sleeping cars, provided the company shall also run trains of ordinary first-class passenger cars in number sufficient to accommodate fully all persons who prefer to travel therein.