The Dark Red Line is part of the planned SRT Red Line suburban railway system to serve the greater Bangkok Metropolitan Region which includes Bangkok Province and 4 adjoining provinces. It will run north–south from Thammasat University's Rangsit campus in Pathum Thani Province to Maha Chai in Samut Sakhon Province.In February 2009, Prime Minister Abhisit Vejjajiva secured a 24 billion baht (US$685 million) loan from the Japanese Government for the 67 km (42 mi) segment.