That is a new MTC bus route that has been launched this past week.
The mini bus service of MTC connects Mylapore with Central Station ( Puratchi Thalaivar Dr. MGR Central Station). It starts from a point on R. K. Mutt Road opposite the tan k of Sri Kapali Temple.
Currently, the service is branded ‘Express’. The service was formally launched by DMK MLA, Udhayanidhi Stalin and is meant to provide cheap transport to the rail station for residents of the Mylapore zone.