N.Y. Railroad Law § 79: Air-brakes

§ 79. Air-brakes. It shall be unlawful for any railroad or other

company to haul or permit to be hauled or used on its line or lines

within this state any freight train that has not a sufficient number of

cars in it so equipped with continuous power or air-brakes that the

engineer on the locomotive drawing such train can control its speed

without requiring brakemen to use the common hand brake for that

purpose.