Sri Lanka Railways S11 is a class of Diesel-electric multiple unit (DEMU) train set built for Sri Lanka Railways by Integral Coach Factory, India[3] and imported through RITES Ltd, an Indian state infrastructure corporation on a line of credit extended by the Indian Government.

Twenty S11 DEMUs were ordered to strengthen long-distance travel on the Coastal Line from Colombo to Matara.

[2] The DMUs were built by Integral Coach Factory,[3] to replace locomotive-hauled passenger trains.

[6] In April 2011, the suspension was revoked after a team from RITES inspected them and declared that the faults were due to an electrical failure caused by tinkering and the DEMU running with more coaches than it was designed for.

[3][7] The S11 DMUs are primarily operated on the Coastal line, connecting Colombo, Galle, and Matara.