lines and 1 non-electrified line. Many lines have been lengthened over time, most notably the Mernda line from Epping to South Morang in 2012 and again to Mernda in 2018. Lines have also changed terminus or layout, including the forthcoming changes to the Cranbourne, Pakenham and Sunbury lines as part of the Melbourne Metro Rail Project. Numerous proposals for new lines or extensions not yet constructed have been made, including the long-outstanding Doncaster railway line and Melbourne Airport rail link. Electrified lines Alamein railway line Belgrave railway line Craigieburn railway line Cranbourne railway line Flemington Racecourse/Showgrounds railway line Frankston railway line Glen Waverley railway line Hurstbridge railway line Lilydale railway line Mernda railway line Pakenham railway line Sandringham railway line Sunbury railway line Upfield railway line Werribee railway line Williamstown railway line City Loop (incorporated into several other lines) Non-electrified lines Deer Park–West Werribee railway line (non-electrified train service operated by V/Line) Melton railway line (non-electrified train service operated by V/Line) Stony Point railway line (non-electrified train service beyond Frankston) Stony Point line and metropolitan V/Line services Stony Point line services operate as shuttles from Frankston station with passengers to and from Flinders Street required to change trains. It is the only non-electrified line operated by Metro Trains, with services being operated using Sprinter diesel multiple units leased from V/Line. Melton (Ballarat line) and Wyndham Vale (Geelong line) services are operated by V/Line and depart from Southern Cross, but are within the metropolitan ticketing zone. Bacchus Marsh/Melton/Ballarat trains stop at Cobblebank, Rockbank, Caroline Springs, Deer Park and Ardeer. Wyndham Vale/Geelong trains also stop at Ardeer and Deer Park, along with Tarneit. Only Wyndham Vale and Ballarat trains stop at Ardeer, not Geelong trains. 5 morning peak and 3 afternoon peak trains operate to and from Wyndham Vale. One weekday morning service and numerous football services operate to Wyndham Vale. After the Ballarat Line Upgrade was completed on the 1st of January 2021, during the week, Melton sees services every 20 minutes. This includes the every 40 minutes off peak from trains to/from Ballarat. During the peak, Melton services only stop at Cobblebank, Caroline Springs, Ardeer, Sunshine and Footscray, where as Ballarat (Wendouree) trains stop at all other stations including Sunshine and Footscray, but not Melton. A shuttle service runs from Caroline Springs to Rockbank for anyone willing to travel to Ballarat. On the weekend, all services are every hour. Sunbury