 A scheme to introduce light rail to Watford was conceived in 2009 when it was proposed that the Abbey Line should be converted to tram-train operation and run by Hertfordshire County Council.The project was cancelled due to the complications and expense of transferring the line from National Rail to the county council.In 2013 the Croxley Rail Link project was approved to extend the London Underground Metropolitan line to Watford Junction by reinstating a stretch of the former Watford and Rickmansworth Railway.