The Kelani Valley railway line in Sri Lanka, covering the breadth of Colombo District.

It crosses the Southern Expressway near Homagama and continues east towards Avissawella, the current terminus of the line.

Major railway stations on the line are Colombo Fort, Maradana, Narahenpita, Nugegoda, Maharagama, Pannipitiya, Kottawa, Homagama, Meegoda, Padukka, Waga, Kosgama, and Avissawella.

As of January 2016, there were 20 trains operating on the line daily, mainly catering to rush hour commuters traveling to and from Colombo.

In addition to this, Sri Lanka Railways introduced a rail bus service to cater commuters traveling between Kosgama and Maharagama during daytime.