The Mashhad Urban Railway is a rapid transit urban rail line in Mashhad, Iran. It is the second rapid transit system in Iran.The project has been known by a number of terms, including “light rail”, “light metro”, “urban rail”, and “metro”, though the system’s full grade-separation from traffic and four minute headway as of September 2013 fully qualify it as a rapid transit or “metro” system. The Mashhad Urban Railway operates its single line from 6:30 to 21:30 daily. A second line is currently under construction.