The Airdrie to Bathgate Rail Link is a railway in central Scotland. Instigated as part of a round of transport improvement projects proposed by the then Scottish Executive in 2003, the plan was to open up a fourth direct railway link between the cities of Glasgow and Edinburgh. The project was completed in October 2010, at an estimated cost of £300 million. The rail link received the final approval of the Scottish Parliament on 28 March 2007, and gained royal assent on 9 May 2007.