N.J. Stat. § 48:12-87.2
It shall be unlawful for any person, firm, company, corporation, trustee or receiver operating a railroad as a common carrier for hire in whole or in part in this State to haul or permit to be hauled or used within this State any car as a caboose if said car has been acquired or purchased after the effective date of this act and does not conform to the requirements of this act. Such cars except for interior finish shall be of steel construction, shall be equipped with a platform on each end thereof not less than 24 inches wide having secure guardrails, grab irons and steps equipped with suitable rods, boards or other guards at each end and at the back thereof; shall be at least 24 feet in length exclusive of platforms; shall be of constructive strength equal to that of 100,000 pounds capacity freight cars; shall be equipped with drawbars and draft gears designed to adequately handle slack action; and shall have trucks with 4 wheels each. Said cars shall be equipped with automatic air brakes, a conductor's air valve, and air valves and a whistle fixed at or adaptable to either platform. Said cars shall have a door in each end thereof; shall have bay windows, or cupolas of sufficient size to accommodate at least 2 men and served with suitable steps for access thereto. Said cars shall have a sanitary toilet room; an ice box or refrigerator, a water cooler, and clothes lockers with recessed knobs; and shall have suitable heating equipment. The cars shall be equipped with wipers attached to the bay windows; and all windows shall be of shatterproof glass.
N.J.S. § 48:12-87.2