ticketing system is the main ticketing system currently in use across Melbourne, introduced in 2010. Prior to December 2012 Melbourne also used a magnetic strip paper ticket system known as the Metcard, first introduced to the railway network in 1996. On 29 December 2012 Metcard was no longer available for use on Melbourne's public transport and completely replaced by myki. Multi-modal tickets were first introduced in Melbourne in 1969 and prior to this train, tram and bus services all had separated ticketing systems. Host stations and premium stations Host stations and premium stations are categories of railway stations on the suburban rail network. A premium station is staffed from first train to last, seven days a week, while a host station is staffed only during the morning peak. Of the 222 (current as of 2021) stations in Melbourne's railway network, there are 82 premium stations, in addition to the five City Loop stations. Although plans for the premium station program were unveiled in 1991 (under the guise of 'Safe Stations'), the program was commenced in 1994 by the Public Transport Corporation, with Mount Waverley being the first station given premium status. By the end of 1995 the number of staffed stations increased from 35 to 51. It was proposed to upgrade further stations to premium status in the future. The host station program was introduced by the Victorian Department of Transport in the early 2000s to ensure that over 80% of suburban rail passengers started their journey from a staffed (host or premium) station. Regional services V/Line regional services share tracks with several suburban train lines from the outskirts of Melbourne to the regional railway terminus at Southern Cross station (with the Traralgon V/Line rail service terminating at Flinders Street station). The Pakenham line has the longest shared track section which is used by V/Line services to the Traralgon and Bairnsdale. The Sunbury and Craigieburn lines also share lesser sections of track with counterpart regional lines. The Regional Rail Link project separated suburban services from regional trains on the Geelong, Wendouree (Ballarat) and Bendigo lines. A ceremonial start of construction was held in August 2009 and the project was completed in June 2015. Freight services Melbourne also has an extensive network of railway lines and yards to serve freight traffic. These freight lines are of two gauges— broad gauge and , and are not electrified. In the inner western suburbs