The agency was founded in 1971, replacing the private Columbus Transit Company. Mass transit service in the city dates to 1863, progressively with horsecars, streetcars, and buses. The Central Ohio Transit Authority began operating in 1974, and has made gradual improvements to its fleet and network. Its first bus network redesign took place in 2017. The 2010s have also seen noted service improvements, with the addition of the CBUS free downtown circulator in 2014, its AirConnect airport service in 2016, and the CMAX bus rapid transit service in 2018.