An Act amending the act of August 10, 1951 (P. L. 1189, No. 265), entitled, as amended, "An act regulating the appointment, promotion, suspension, reduction, removal and reinstatement of employes (except superintendents, assistant superintendents, inspectors, chief clerks and school guards) in bureaus of police in cities of the second class; and defining the powers and duties of civil service commissions in such cities for such purposes," further providing for positions in the competitive class of the civil service, for examinations, for reinstatement of employees, for eligibility for promotion and appointment, for filling vacancies, for the composition of police trial boards, for removal, discharge and suspension, and for reductions in force.