New South Wales D set

D set
D set
	D44 & D43 at Gosford station, January 2025
	Interior (lower deck)
Stock type	Electric multiple unit
In service	2024–present
Manufacturer	Hyundai Rotem
Built at	Changwon, South Korea
Replaced	V sets; H sets (to be transferred to Sydney's suburban lines);
Constructed	2019–present
Entered service	3 December 2024
Number built	610 carriages (70 4-car sets, 55 6-car sets)
Number in service	~160+ carriages (~30 4-car sets & ~7 6-car sets) as of 16 June 2025
Formation	4-car sets:; DD–DN–DND–DDA; 6-car sets:; DD–DNL–DT–DN–DND–DDA;
Fleet numbers	D1–D70 (4-car sets); D101–D155 (6-car sets);
Capacity	325 seated (4-car sets); 491 seated (6-car sets);
Operators	Sydney Trains
Depots	Kangy Angy Maintenance Centre
Lines served	Central Coast & Newcastle;
Specifications
Car body construction	Stainless steel
Train length	81.55 m (267 ft 6+5⁄8 in) (4-car sets); 122.23 m (401 ft 1⁄4 in) (6-car sets);
Car length	20,435 mm (67 ft 1⁄2 in) (DD/DDA); 20,340 mm (66 ft 8+3⁄4 in) (DNL/DT/DN/DND);
Width	3,034 mm (9 ft 11+1⁄2 in)
Height	4,402 mm (14 ft 5+1⁄4 in)
Doors	Plug-style, 2 per side
Maximum speed	176 km/h (109 mph) (design) 130 km/h (81 mph) (service)
Weight	199.8 t (196.6 long tons; 220.2 short tons) (4-car sets); 298 t (293 long tons; 328 short tons) (6-car sets);
Traction system	Mitsubishi SiC–VVVF
Traction motors	3-phase AC induction motor
Acceleration	0.84 m/s2 (2.8 ft/s2)
Deceleration	1.01 m/s2 (3.3 ft/s2) (service); 1.10 m/s2 (3.6 ft/s2) (emergency);
Electric system(s)	1,500 V DC (nominal) from overhead catenary
Current collector(s)	Pantograph
UIC classification	2′2′+Bo′Bo′+Bo′Bo′+2′2′ (4-car sets); 2′2′+Bo′Bo′+2′2′+Bo′Bo′+Bo′Bo′+2′2′ (6-car sets);
Coupling system	Dellner
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The New South Wales D sets, also referred to as the Mariyung trains, are a class of electric multiple units (EMU) that operate on Sydney Trains' intercity lines. The sets operate on the Blue Mountains Line, Central Coast & Newcastle Line and South Coast Line services. When all sets enter service as planned, they will replace the outgoing V set fleet, and subsequently allow for the reallocation of the entire H set fleet to Sydney's suburban line services.

The first trains were delivered in December 2019. After a protracted dispute between the government and the drivers' trade union over their safety, they entered service on 3 December 2024 on the Central Coast & Newcastle Line.