During the 1960s and 1970s, public transport development in Liverpool concentrated on integration and expansion of the dispersed urban rail lines into a complete rapid transit network with bored tunnels and stations in the centre serving a large part of the city and Merseyside. The resulting metro-like network was called Merseyrail. One of the main proposals was the creation of an Outer Rail Loop by the electrification of a former passenger route through the eastern suburbs, a six platform underground interchange station at Broad Green, and using existing lines in the west of the city. This proposal was unsuccessful due to financial problems and political opposition. The eastern section of the Outer Loop was not built leaving the eastern districts of the city unserved.