74 Pa.C.S. § 1724
(a) Classification of position.—
(b) Change in work force.— The general manager may abolish any office or reduce the force of employees for lack of work or lack of funds, but, in so doing, the officer or employee with the shortest service record in the classification and grade to which the officer or employee belongs shall be first released from service and shall be reinstated in order of seniority when additional force of employees in that job classification and grade is required. No person shall be released from service under this subsection if the person can be transferred: