[Code of Federal Regulations] [Title 30, Volume 1] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 30CFR57.14214] [Page 388] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 57_SAFETY AND HEALTH STANDARDS_UNDERGROUND METAL AND NONMETAL MINES --Table of Contents Subpart M_Machinery and Equipment Sec. 57.14214 Train warnings. A warning that is audible above the surrounding noise level shall be sounded-- (a) Immediately prior to moving trains; (b) When trains approach persons, crossing, other trains on adjacent tracks; and (c) Any place where the train operator's vision is obscured. [[Page 389]]