The Kollam–Sengottai railway line is a railway line in South India which connects Kollam Junction in Kerala state and Sengottai 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.It is the important cargo transportation line connecting Vizhinjam container port and South indian States.

Kollam Junction railway station is an NSG–3 category Indian railway station in Thiruvananthapuram railway division of Southern Railway zone.) It is a junction station situated in the city of Kollam in Kerala, India. It is the second largest railway station in Kerala in terms of area and largest in terms of number of tracks and one of the oldest railway stations in the state. It is also the second busiest railway station in Kerala in terms of trains handled per day. World's third longest railway platform is situated at Kollam railway station.