Paisley's principal railway station is situated on a line which connects Central Station in Glasgow with a junction which branches to the north to Port Glasgow, Greenock and Wemyss Bay, and to the southwest to Ayrshire. Opened in 1840 on the Glasgow, Paisley, Kilmarnock and Ayr Railway, Paisley Gilmour Street Railway Station (Gael: Sràid GhilleMhoire Phàislig) is a fine B-listed Tudor-Gothic edifice which faces onto County Square. Trains come in at a high level, to platforms on the second floor of the building, with retail units and office on the levels below. The two original platforms were extended to four in 1883, and electrification of the line brought further change in 1967. The extensive glass roof, which covers both tracks and platforms, was replaced in 2011 at a cost of £9 million and the £170-million Paisley Corridor Improvement Project, which was completed in 2012, saw track capacity increased between this station and Glasgow Central. Today, the station is operated by ScotRail and used by 4.1 million passengers annually (2015), making it the fourth busiest in Scotland. It is preceded by Hillington West, 2¼ miles (3.5 km) to the east northeast and is followed, on the Inverclyde Line, by Paisley St. James Railway Station, a half-mile (1 km) to the west northwest, and on the Ayrshire Coast Line, by Johnstone, 3 miles (5 km) to the west southwest.