Harbour line (Mumbai Suburban Railway)

The Harbour line is a branch line of the Mumbai Suburban Railway operated by Central Railways. It was named so because it catered to the eastern neighbourhoods along the city's natural harbour. Its termini are Chhatrapati Shivaji Terminus (CST), Andheri and Panvel on the CST-Andheri, CST-Panvel and Panvel-Andheri routes. The first section of the line, between Kurla and Reay Road, opened on 12 December 1910. In 1925, the line was connected to the then Victoria Terminus via an elevated rail corridor between Dockyard Road and Sandhurst Road. Suburban services to Mankhurd began in 1951. The line was later extended from Mankhurd to serve most of Navi Mumbai via the Mankhurd–Belapur–Panvel rail corridor in the 1990s.

The line is a double line and therefore does not have any fast trains on it. The line runs parallel to the Central Railway line till just before Sandhurst Road station where the line turns eastward and runs elevated up till Sewri. At Wadala Road, the line branches into two. The first line joins with the Western line at Mahim and terminates at Andheri. The second line follows through Mankhurd into the city of Navi Mumbai, where it again branches out into two lines, one going to Thane and the other to Panvel. The first stop outside Mumbai is the township of Vashi.