Jingle ads are 20-second audio advertisements played after each station announcement inside local trains, with approximately 350-400 spots available per day per train for brand ads. These ads target routes from Chhatrapati Shivaji Terminus to Karjat, Kasara, and Khopoli on the Central line, and from Chhatrapati Shivaji Terminus to Panvel on the Harbour line, and vice versa.