Z-class Melbourne tram

Z-class
Z-class
	Z3.228 on a Route 58 service on Market Street, July 2023
	Refurbished Z3 class interior
Manufacturer	Comeng
Assembly	Dandenong
Constructed	1975–1983
Entered service	1975
Number built	230
Number in service	87
Number preserved	6
Number scrapped	34
Successor	Z1/Z2: C1, D, and E classes; Z3: G1-class;
Fleet numbers	Z1 1–Z1 100; Z2 101–Z2 115; Z3 116–Z3 230;
Capacity	Z1/Z2: 48/70; Z3: 42/70; (seated/standing)
Depots	Brunswick; Essendon; Glenhuntly; Malvern;
Specifications
Train length	Z1/Z2: 16 m (52 ft 6 in); Z3: 16.64 m (54 ft 7 in);
Width	2.67 m (8 ft 9 in)
Height	Z1/Z2: 3.55 m (11 ft 8 in); Z3: 3.41 m (11 ft 2 in);
Doors	4 double, 2 single (Z3 only)
Wheel diameter	Z1/Z2: 680 mm (27 in); Z3: 660 mm (26 in);
Wheelbase	1.8 m (5 ft 11 in)
Maximum speed	70–72 km/h (43–45 mph) (design); 60 km/h (37 mph) (service);
Weight	Z1/Z2: 19 t (19 long tons; 21 short tons); Z3: 21.8 t (21.5 long tons; 24.0 short tons);
Traction system	Z1/Z2: ASEA Tramiac resistance control; Z3: AEG/Siemens chopper control;
Traction motors	Z1/Z2: 4 × ASEA LJB 23/2 57 kW (76 hp); Z3: 2 × AEG ABS 3322 195 kW (261 hp);
Power output	Z1/Z2: 228 kW (306 hp); Z3: 390 kW (523 hp);
Acceleration	1.5 m/s2 (3.4 mph/s)
Deceleration	1.6 m/s2 (3.6 mph/s) (Dynamic braking); 1.4 m/s2 (3.1 mph/s) (Mechanical braking); 3 m/s2 (6.7 mph/s) (Emergency);
Electric system(s)	600 V DC (nominal) from overhead catenary
Current collector(s)	Pantograph
UIC classification	Bo′Bo′ (Z1/Z2); B′B′ (Z3);
Bogies	Z1/Z2: ASEA; Z3: Duewag tandem-drive;
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references

The Z-class are single-unit bogie trams that operate on the Melbourne tram network. Between 1975 and 1983, 230 trams spanning three sub-classes were built by Comeng, Dandenong. The design was based on two similar Gothenburg tram models, and a prototype built by the Melbourne & Metropolitan Tramways Board. While the Z1 and Z2-class trams were very similar, the Z3-class had significant design changes.

Since introduction they have had a variety of liveries, and modifications. The Z1 and Z2-class trams have been retired, with 87 Z3-class trams remaining in service.