day. It charges train fares and runs between Carlingford and Parramatta. It is operated by Hillsbus. Bankstown Line replacement bus services Beginning in 2019, buses are replacing trains between Bankstown and Sydenham during the Christmas and New Year period for preliminary works relating to the Bankstown Line metro conversion. This procedure will continue until 2023, after which that section of the line will be temporarily closed for several months to complete its integration into the City & Southwest Metro Line. Trackwork Buses Buses are also frequently used to replace train lines that are closed for trackwork, mainly on weekends or late nights. These replacement services are contracted out to a bus company by Sydney Trains. Because it is impossible for one bus company to provide enough buses, the company will then subcontract some of the work to other bus companies. The routes are defined by Sydney Trains, with route numbers consisting of one or two digits, optionally followed by "A" (usually indicates short working variant), then the train line the route replaces. Examples include 35T3, 61T8 etc. On Demand services Since late 2017, a number of On Demand services have been introduced throughout the metropolitan and outer metropolitan bus regions. These are not part of the Opal card ticketing system and most do not accept concession fares. However, OpalPay and concession fares can be used and accepted on some of these services. As of March 2020, the on demand services in Greater Sydney are: Central Coast on demand service - operated by Community Transport Central Coast's CoastConnect Edmondson Park on demand service - operated by Interline Bus Services' Interline Connect Inner West on demand service - operated by Transit Systems' Bridj Illawarra on demand service - operated by Premier Motor Service's Premier Illawarra On Demand (PODPI) Norwest on demand service - started May 2019 - operated by Hillsbus' MetroConnect Northern Beaches on demand service - started November 2017 - operated by Keolis Downer's Keoride The Ponds on demand service - started May 2019 - operated by Busways' Cooee Busways Other on demand services have also been trialled but have since ceased, including: Bankstown on demand service - operated by Punchbowl Bus Company's Punchbowl On Demand (POD) - ceased 14 October 2018 Carlingford and North Rocks on demand service - operated by Hillsbus' OurBus - ceased 24 May 2019 Eastern Suburbs on demand service - operated by Bridj, formerly by Transdev's