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
Replaced	Many W2 and SW2 class trams
Constructed	1975–1983
Entered service	1975
Number built	230
Number in service	86
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 collection	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, in 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 86 Z3-class trams remaining in service.