Persons employed as platform men or bus operators in the operating department of the municipal railway system shall be subject to the following conditions of employment: The basic hours of labor shall be eight hours, to be completed within 10 consecutive hours, and there shall be two days off, consecutive where practicable, in each week. All labor performed in excess of eight hours in any one day, or after a spread of 10 consecutive hours in any one day, or five days in any one week, shall be paid for at the rate of time and one-half.
Conductors and motormen may be assigned to duty as bus operators and while assigned to such duty they shall receive the compensation fixed for such service. Such assignment shall be governed by seniority of service, subject to a qualifying test by the railroad management as to competency and to state laws as to qualifications and licensing.