The several second-class townships, in which the money, hereby allocated, is expended by the Department of Highways, are hereby authorized and directed to turn over to the Department of Highways, for use in the maintenance of any road or street within the legal limits of such township, any road building machinery or equipment, now owned by such municipality, without charge for such use by the department. Any repairs to said equipment, which become necessary while in the possession and use of the Department of Highways for the purposes of this act, shall be made only with the consent and approval of the township authorities, and shall be paid for out of the funds hereby allocated to such township, whether the said repairs are made necessary by ordinary wear and tear or by negligence in the operation. The duly elected road supervisors of each township shall elect a Road Master, who may be a member of the Board of Supervisors, who, subject to the approval of the Secretary of Highways, shall be employed by the Department of Highways in a supervisory capacity in the work to be done on the roads of such township under the provisions of this act.