Operated by Sri Lanka Railways, the line includes some of the busiest rail services in the country.

[3] The Coastal line begins at Maradana Station and runs west towards Colombo Fort.

It then turns south and runs through much of Colombo parallel to the beaches on the city's west coast, passing many commuter rail stations, such as Slave Island.

The commuter rail services end as the line continues south along the coast towards Galle.

[citation needed] In the mid-twentieth century, the coastal line experienced many changes to accommodate growing traffic.

Express trains began serving the line, including the now celebrated Ruhunu Kumari.

[5] In 2011–2012, the Coastal Line underwent complete reconstruction between Kalutara and Matara, to upgrade the track.

The line was upgraded to be able to handle trains at 100 km/h (62 mph), allowing for shorter journey times and smoother service.

[6] The alignment shifts inland after Beliatta to protect sensitive natural habitats along the coast and minimise damage to property.

A feasibility study and an environment impact assessment for the Beliatta to Hambantota and Kataragama phases of construction has been approved by the Cabinet.