Coolhaven metro station in the context of "Rotterdam Metro"

The Rotterdam Metro (Dutch: Rotterdamse Metro) is a rapid transit system operated in Rotterdam, Netherlands and surrounding municipalities by RET. The first line, called Noord – Zuidlijn (lit. 'North – South line') opened in 1968 and ran from Centraal Station to Zuidplein, crossing the river Nieuwe Maas in a tunnel. It was the first metro system to open in the Netherlands. At the time it was also one of the shortest metro lines in the world with a length of only 5.9 km (3.7 mi).

In 1982 a second line was opened, the Oost – Westlijn (lit. 'East – West line'), running between Capelsebrug and Coolhaven stations. In the late 1990s, the lines were named after two historic Rotterdam citizens, the Erasmus Line (North – South) after Desiderius Erasmus and the Caland Line (East – West) after Pieter Caland. As of December 2009, these names were dropped again in favour of a combination of letters and colours, to emphasise and clarify the difference between the separate branches, especially of the former East – West line.