sentences:  Croxley Rail Link
  
  The Croxley Rail Link, or the Metropolitan Line Extension, was a proposed railway engineering project in the Watford and Three Rivers districts of Hertfordshire, England, that would have connected the London Overground and the London Underground's Metropolitan line at .The Metropolitan line's terminus at Watford Underground station would have been closed and the line diverted and extended from Croxley to Watford Junction via a reopened section of closed line.