The Federal Railroad Administration is conducting a retrospective review of its locomotive train horn regulation (49 CFR part 222) that requires engineers to sound warnings signals at grade-level road crossings and provides a procedure for municipalities to establish quiet zones where safety gates or other devices preclude the need for horn signals by preventing vehicles from crossing the tracks ahead of trains.
展开▼
机译：联邦铁路管理局正在对其机车火车喇叭法规（49 CFR part 222）进行回顾性审查，该法规要求工程师在坡度平交道口发出警告信号，并为市政当局提供建立安全门或其他装置的安静区域的程序通过防止车辆越过火车前的铁轨来消除对号角信号的需求。
展开▼
