Siemens Nexas

Siemens Nexas
Refurbished Siemens Nexas 789M at Seaford station, January 2026
Refurbished interior
In service	2003–present
Manufacturer	Siemens Transportation Systems
Built at	Vienna, Austria
Family name	Modular Metro
Constructed	2002–2005
Entered service	3 April 2003
Number built	216 carriages (72 sets)
Number in service	216 carriages (72 sets)
Formation	3-car sets (M–T–M)
Fleet numbers	701M–844M (driving motors) 2501T–2572T (trailers)
Capacity	Until 2016: 264 seated per 3-car set Since 2016: 216 seated per 3-car set
Operator	Metro Trains Melbourne
Lines served	Sandringham Werribee Williamstown Craigieburn Upfield Frankston Flemington Racecourse
Specifications
Car body construction	Stainless steel single deck
Train length	71.91 m (235 ft 11+1⁄8 in)
Car length	M: 24.07 m (78 ft 11+5⁄8 in) T: 23.77 m (77 ft 11+13⁄16 in)
Width	2.95 m (9 ft 8+1⁄8 in)
Height	4,141 mm (13 ft 7+1⁄16 in)
Floor height	1.23 m (4 ft 7⁄16 in)
Doors	Twin-leaf plug, 2 × 2 per car
Wheel diameter	850–770 mm (33–30 in) (new–worn)
Wheelbase	2.6 m (8 ft 6 in)
Maximum speed	147 km/h (91 mph) (design) 115 km/h (71 mph) (service)
Weight	41.5 t (40.8 long tons; 45.7 short tons) (driving motors, tare) 37.8 t (37.2 long tons; 41.7 short tons) (trailers, tare)
Axle load	18.5 t (18.2 long tons; 20.4 short tons)
Traction system	Siemens SIBAC G1500 D1100/400 M5-1 IGBT–VVVF inverter
Traction motors	8 × Siemens 1TB2016-0GB02 250 kW (340 hp) 3-phase AC induction motor
Acceleration	1.2 m/s² (3.9 ft/s²) (design) 1 m/s² (3.3 ft/s²) (service)
Deceleration	1 m/s² (3.3 ft/s²) (service) 1.3 m/s² (4.3 ft/s²) (emergency)
Electric systems	1,500 V DC (nominal) from overhead catenary
Current collection	Pantograph
UIC classification	Bo′Bo′+2′2′+Bo′Bo′
Bogies	SF 5000 E TDG (powered), SF 5000 LDG (trailer)
Minimum turning radius	118 m (387 ft 2 in)
Coupling system	Dellner
Track gauge	1,600 mm (5 ft 3 in) broad gauge

The Siemens Nexas is a class of electric multiple units manufactured by Siemens Transportation Systems for the suburban railway network of Melbourne, Australia between 2002 and 2005. The design of the trains was based on the Siemens Modular Metro.