Arizona Revised Statutes Title 40. Public Utilities and Carriers § 40-881. Train crew requirements

A. A passenger, mail or express train composed of less than six cars, when operated outside yard limits shall carry a crew consisting of not less than one engineer, one fireman, one conductor and one flagman.  This subsection shall not apply to gasoline motor cars.

B. A passenger, mail or express train composed of six or more cars, when operated outside yard limits on main line tracks, shall carry a crew consisting of not less than one engineer, one fireman, one conductor, one flagman, and one brakeman.  When such train is operated outside yard limits on branch lines (including the use of main lines where necessary to reach initial or final terminals of branch lines) it shall carry a crew consisting of not less than one engineer, one fireman, one conductor, and one brakeman.