services used to also be operated by V/Line until 2012 when the electrical network was extended to Sunbury and these trains also stopped at Diggers Rest; Sunbury passengers can still catch V/Line trains to or from Bendigo. The redundant carriages were moved onto Bacchus Marsh services instead. V/Line trains used to also operate to Donnybrook, stopping at Craigieburn but since the electrical network was extended to Craigieburn in 2007, trains have stopped terminating at Donnybrook. Service patterns Suburban services are operated by Metro Trains Melbourne. Railway lines and service patterns are often classified into groups, which are: Burnley group Lilydale, Belgrave, Alamein and Glen Waverley line (blue) Caulfield group Pakenham and Cranbourne line (light blue) Sandringham line (pink) Clifton Hill group Mernda and Hurstbridge line (red) Northern group Sunbury, Craigieburn and Upfield line (yellow) Cross-City group Frankston, Werribee and Williamstown line (green) Stony Point line (non-electrified train service beyond Frankston) Special event services Flemington Racecourse/Showgrounds All lines (except for the Frankston, Werribee, Williamstown and Sandringham lines) use the city loop. The Clifton Hill Group runs clockwise all day and the Caulfield Group runs Counter-Clockwise all day. The Burnley Group runs counter-clockwise in the morning and switches to clockwise in the afternoon. The Northern Group runs clockwise in the morning and counter-clockwise on the afternoon. As of 1st of January 2021, Frankston and Newport (Werribee and Williamstown) trains have been completely removed out of the City Loop. When the Metro Tunnel opens in 2025, Pakenham, Cranbourne and Sunbury line trains will be removed from the loop, and the Frankston line will move back into the Caulfield loop. Also at this time, the Werribee line will run direct to Sandringham and vice versa. Melbourne uses clock-face scheduling in off-peak periods, but generally not in rush hour, due to the network operating near to infrastructure capacity and having to accommodate single-line sections, flat junctions, and regional diesel-hauled trains. Frequencies vary according to time of day, day of week and by line. In some places, usually interchange stations, services on two lines combine to provide more frequent services on common sections of tracks. All services become 24-hour from Friday morning to Sunday evening, with at least one departure every hour after 12am. Along with other Australian railways, Melbourne uses the British terminology of "up" and "down", with "up" being defined as toward Flinders Street station in the CBD. Fares and tickets The myki smart-card