Nothing contained in sections 94.700 to 94.755 shall be construed to prevent a city from appropriating and paying moneys from any of its other revenues to an interstate transportation authority, a city transit authority or a city utilities board for any of the purposes enumerated in sections 94.700 to 94.750, and all cities are empowered to appropriate and pay or expend moneys from any of its revenues for the public mass transportation purposes enumerated in sections 94.700 to 94.755.