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New South Wales D set
The D sets, also referred to as the Mariyung trains, are a class of double-decker electric multiple units (EMU) that operate on Sydney Trains intercity lines. Built by Hyundai Rotem, the trains currently operate on the Central Coast & Newcastle Line, Blue Mountains Line and the South Coast Line. The D sets replaced the former V set fleet, and will allow for the reallocation of the entire H set fleet to Sydney's suburban line services once all sets are introduced into service.
The first trains were delivered in December 2019. After a protracted dispute between the government and the drivers' union over their safety, they entered service on 3 December 2024 on the Central Coast & Newcastle Line. On 13 October 2025, the D sets also entered service on the Blue Mountains Line. On 14 April 2026, the D sets also entered service on the South Coast Line.
In May 2014, the Government of New South Wales announced its intention to purchase new carriages for the intercity network, then-operated by NSW TrainLink. The new trains would replace the V sets and allow the H sets to be cascaded to Sydney Trains suburban services. The class of trains were given the name Mariyung, a Dharug word for emu.
In August 2014, expressions of interest from manufacturers were called for. The following parties responded:
In July 2015, the government announced that Alstom, Downer/Changchun, Stadler, and UGL/Mitsubishi Electric/CSR had been shortlisted to tender. Following the merger of CSR and the parent company of Changchun Railway Vehicles, Hyundai Rotem replaced CSR as a partner in the UGL/Mitsubishi Electric consortium. The consortia provided two variants of their designs – a longer train and shorter train. The Hyundai Rotem/UGL/Mitsubishi Electric consortium was announced as the successful bidder in August 2016. The companies formed a joint venture called RailConnect to manage the project. The trains are being built by Hyundai Rotem's Changwon factory in South Korea.
The initial contract covered the supply and maintenance of the 512 carriages which would consist of 77 4-car trains and 34 6-car trains. The maintenance contract runs for fifteen years from the delivery of the first train with an option for a five-year extension. In February 2019, a further 42 carriages were ordered to extend 21 of the 77 4-car trains into 6-car trains to allow for more 10-car train operations especially on the South Coast line during peak hour.
A separate contract was let to the John Holland Group for the construction of the Kangy Angy Maintenance Centre, which was completed in August 2020. A contract was let to Downer EDI to make modifications and upgrades to existing rail infrastructure across the electrified network to accommodate the new fleet. Platform extensions at multiple stations were also required to accommodate 10-car trains.
The first two 10-carriage trains were delivered in December 2019 and testing started the following month.
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New South Wales D set
The D sets, also referred to as the Mariyung trains, are a class of double-decker electric multiple units (EMU) that operate on Sydney Trains intercity lines. Built by Hyundai Rotem, the trains currently operate on the Central Coast & Newcastle Line, Blue Mountains Line and the South Coast Line. The D sets replaced the former V set fleet, and will allow for the reallocation of the entire H set fleet to Sydney's suburban line services once all sets are introduced into service.
The first trains were delivered in December 2019. After a protracted dispute between the government and the drivers' union over their safety, they entered service on 3 December 2024 on the Central Coast & Newcastle Line. On 13 October 2025, the D sets also entered service on the Blue Mountains Line. On 14 April 2026, the D sets also entered service on the South Coast Line.
In May 2014, the Government of New South Wales announced its intention to purchase new carriages for the intercity network, then-operated by NSW TrainLink. The new trains would replace the V sets and allow the H sets to be cascaded to Sydney Trains suburban services. The class of trains were given the name Mariyung, a Dharug word for emu.
In August 2014, expressions of interest from manufacturers were called for. The following parties responded:
In July 2015, the government announced that Alstom, Downer/Changchun, Stadler, and UGL/Mitsubishi Electric/CSR had been shortlisted to tender. Following the merger of CSR and the parent company of Changchun Railway Vehicles, Hyundai Rotem replaced CSR as a partner in the UGL/Mitsubishi Electric consortium. The consortia provided two variants of their designs – a longer train and shorter train. The Hyundai Rotem/UGL/Mitsubishi Electric consortium was announced as the successful bidder in August 2016. The companies formed a joint venture called RailConnect to manage the project. The trains are being built by Hyundai Rotem's Changwon factory in South Korea.
The initial contract covered the supply and maintenance of the 512 carriages which would consist of 77 4-car trains and 34 6-car trains. The maintenance contract runs for fifteen years from the delivery of the first train with an option for a five-year extension. In February 2019, a further 42 carriages were ordered to extend 21 of the 77 4-car trains into 6-car trains to allow for more 10-car train operations especially on the South Coast line during peak hour.
A separate contract was let to the John Holland Group for the construction of the Kangy Angy Maintenance Centre, which was completed in August 2020. A contract was let to Downer EDI to make modifications and upgrades to existing rail infrastructure across the electrified network to accommodate the new fleet. Platform extensions at multiple stations were also required to accommodate 10-car trains.
The first two 10-carriage trains were delivered in December 2019 and testing started the following month.