The City Loop (properly called the Melbourne Underground Rail Loop or MURL) is a railway - mostly underground, but partly surface-level and partly elevated - that encloses the central business district of Melbourne, Victoria, Australia. It contains five stations, three of which are underground. The stations include the city's two largest (and the two above-ground): Flinders Street and Southern Cross (formerly Spencer Street) stations; as well as Flagstaff, Melbourne Central (formerly Museum), and Parliament stations. Melbourne's 16 radial suburban railway lines feed into the Loop at its northwestern and southeastern corners. The underground section of the Loop follows La Trobe and Spring Streets along the northern and eastern edges of the CBD's street grid. Photography was banned in the Loop in 2004, much to the disappointment of railway enthusiasts. Source: [wikipedia: city loop, melbourne]