In any city which has acquired prior to the effective date of this act or thereafter acquires, as provided by law, any street-railway system or bus system, the governing body shall by ordinance create a street-railway or bus department, provide for the superintendent and such other officers and employees as may be necessary for the proper management and operation thereof, and provide for their compensation.

All revenues of said department and all revenues of said street-railway or bus system shall be used to pay the costs and expenses of operating said system, for the purchase of necessary equipment, and for providing improvements to such system, and any of such revenues not needed for such purposes, as determined by the governing body of the city, shall be used to help retire and pay interest on any bonds issued under Kan. Stat. Ann. §§ 12-803c and on any bonds issued to acquire such system.

Whenever any part of such revenues for any year is not needed for any of the above-stated purposes, as determined by the governing body of the city, such surplus revenue may be transferred by said governing body and merged into the city’s general operating fund or the city’s general revenue fund.