The Kollam–Sengottai railway line (formerly known as Quilon–Shencottah or Quilon–Chenkotta line) is a railway line in South India which connects Kollam Junction in Kerala state and Sengottai (also spelled Shencottah, Shenkottai, Chengottai, Chenkottai, Senkottai) in Tamil Nadu. The Quilon–Shencottah railway line was the first railway line in the erstwhile Travancore state and is more than a century old. The Kollam–Sengottai section is part of the Kollam–Chennai metre-gauge rail route commissioned by the British in 1904. The line has been completely converted to broad gauge and is now fully operational from Kollam Junction to Shengottai.