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Melbourne's tram classification system is based on an alphanumeric combination of a primary letter for an individual vehicle type or class, with a system of prefixes and suffixes to indicate specific vehicle attributes, versions, or iterations.
The current classification system was introduced in 1923 by Tom Percival Strickland, the Chief Engineer of the Melbourne & Metropolitan Tramways Board (M&MTB) based on his experience having previously worked on the original Sydney electric tramway network, which also used an alphanumeric tram classification schema.
With the recent unification of different council and privately-operated trams into the new M&MTB, Strickland assigned a letter-based classification to each distinct design of tram. The order of assignment was determined by the total fleet size of the original operator; and largely reflecting the sequence in which each different type of tramcar was introduced between 1906 and 1920.
While this broadly followed an alphabetical order and most letters between A and T were assigned, it was not a strict requirement; the letter 'I' was not used, possibly to avoid confusion with the numeral 1 in written records.
Following modifications to further standardise the fleet, and aid maintenance and spare parts inventory, the classification system was simplified in 1928 (or possibly earlier) to use fewer classes and recognise the common electrical traction and braking equipment being retrofitted to vehicles of similar outline. This included:
While Comeng had developed an iteration of the Z Class (with an internal designation of 'Z4 Class'), this was subsequently abandoned at the direction of the incoming Cain Labor government in 1982, who requested a contract variation to deliver twenty-eight single-unit trams of a revised design to be known as the A1 Class, and what would later become the two B1 Class articulated prototype trams. With the original A Class trams having long been retired, this reset the letter-based classifications which all subsequent modern trams have followed.
As the standard types were modified or iterated, variations on a design were given extra letters or incremental numerals before and after the main class letter, to indicate particular features, individual vehicle upgrades, or where a design had been improved.
S - used to indicate trams of a particular class that had been upgraded from canvas blinds and drop bars to sliding doors - including the SW2, SW5, and SW6 classes.
C - when used as a prefix, this denoted trams fitted with recycled traction and braking equipment recovered from former C Class trams. Only used on the CW5 Class.
Numerical suffixes may be applied to a variant of a tram class in the following scenarios:
If only one type of vehicle is planned to be introduced, a numerical suffix is not used for the initial vehicle design (e.g. Z Class and E Class) but may be added with later substantial upgrading or rebuild.
Alphabetical suffixes have not been frequently used for tramcars in Melbourne, with the exception of the 'C' suffix used for one former Z Class tram (No. 5) briefly reclassified as the ZC Class after it received chopper-control equipment in a trial.
Works trams used for maintenance, internal transportation, and other support tasks have been numbered individually, with individual vehicles receiving either of an:
In the 1950s and 1970s, the two prototype vehicles constructed using imported PCC type traction and braking equipment in locally constructed bodies (No. 980 and No. 1041) were each identified as the PCC Class.
The three 'luxury car' trams purchased from the Victorian Railways on the closure of the St Kilda to Brighton Beach line were classified as the VR Class in M&MTB service.
Individual classes were initially written with the designator encased in double primes (e.g. 'Class "W"'); later official references transposed this format to "W Class". A hyphen or dash is not used for either the proper noun or compound adjective form, consistent with longstanding practice and relevant government style guidance.
Individual tram fleets had been numbered (from 1 upwards) by each of the pre-M&MTB tramway operators, but by 1924 the M&MTB had consolidated the numbering across the combined fleet. With the introduction of Z class trams, the M&MTB started a new numbering system. Tramways in Ballarat, Bendigo, Geelong, Sorrento and the Victorian Railways had their own tram numbering systems. Trams which were moved between the systems were renumbered.
There were also many non-passenger trams (such as rail grinders, breakdown cars, and freight cars) which were often derived from repurposed trams, but were not included in the classification or numbering system. Such vehicles were assigned a 'W' to denote their 'works' status.
| Image | Class | Description | Fleet numbers |
|---|---|---|---|
| A class | Single truck, drop end, open California combination, built by Duncan & Fraser (1910–1911) for PMTT: 49 | 1–20 | |
| B class | Single truck, drop end, open California combination, built by James Moore & Sons (1917–1918) for PMTT: 50 | 21–24, 84–91 | |
 | C class | Maximum traction, bogie, drop end and centre combination, built by Duncan & Fraser (1913) for PMTT: 51 | 25–35 |
| D class | Maximum traction, bogie, drop end and centre combination, built by Duncan & Fraser (1914) for PMTT: 51 | 36 | |
 | E class | Maximum traction, bogie, drop end and centre combination, built by Duncan & Fraser (1914) for PMTT: 52 | 36–45 |
| F class | Single truck, straight sill, clerestory-roofed, single aisle summer car, built by Duncan & Fraser (1912) for PMTT: 52 | 46–47 | |
| G class | Single truck, straight sill, single aisle summer car, built by Duncan & Fraser (1913) for PMTT: 53 | 48–53 | |
 | H class | Single truck, drop end, open California combination, built by Duncan & Fraser (1913) for PMTT: 54 | 54–63 |
 | J class | Single truck, drop end, open California combination, built by Meadowbank Manufacturing Company (1915) for PMTT: 54 | 64–83 |
| K class | Single truck, drop end, open California combination, built by Moore (1919–1920) for PMTT: 55 | 92–100 | |
| L class | Bogie combination, built by James Moore & Sons (1921) for PMTT: 56 | 101–106 | |
 | M class | Single truck, drop end, open California combination, built by Duncan & Fraser (1917) for HTT and FTT: 58 | 107–116, 183–189 |
 | N class | Maximum traction, bogie, drop end and centre combination, built by Duncan & Fraser (1916) for HTT: 59 | 117–126 |
| O class | Maximum traction, bogie, straight sill, combination with one drop end, built by Duncan & Fraser (1912) for PMTT: 60 | 127–130 | |
 | P class | Maximum traction, bogie, drop end and centre combination, built by Duncan & Fraser (1917–18) for HTT: 61 | 131–138 |
| Q class | Single truck, straight sill, closed combination, built by MMTB (1922–1923): 62 | 139–150, 190–201 | |
| R class | Single truck, straight sill, closed combination, built by James Moore & Sons (1920) for FNPTT: 63 | 151–153 | |
| R class | Single truck, straight sill, closed combination, built by MMTB (1920): 63 | 172–176 | |
 | S Class | Single truck, drop end, open California combination built by Duncan & Fraser (1916–1922) for MBCTT and MMTB: 64 | 154–171 |
 | T Class | Single truck, drop end, open combination with long saloon, built by Duncan & Fraser (1917) for MBCTT: 65 | 177–182 |
 | U Class | Single truck, saloon, built by J.G. Brill and assembled by Duncan & Fraser (1906) for NMETL: 66 | 202–211 |
| V Class | Single truck, open cross bench, built by J.G. Brill and assembled by Duncan & Fraser (1906) for NMETL: 67 | 212–216 | |
 | W Class | Bogie drop centre combination, built 1923–1927 by Holden, James Moore & Sons and MMTB: 23 : 112 | 219–418 |
 | W1 Class | Bogie drop centre combination, built by MMTB (1925–1928): 25 | 419–438, 470–479 |
 | W2 Class | Bogie drop centre combination, built by MMTB and James Moore & Sons (1927–31): 26 | 439–458, 480–609, 624–653 |
 | W3 Class | Bogie drop centre combination, built MMTB (1930–1934): 32 | 654–669 |
 | W4 Class | Bogie drop centre combination, built MMTB (1933–1935) | 670–674 |
| CW5 Class | Maximum traction, bogie, drop centre combination, built MMTB (1934–1935): 38 | 681–685 | |
 | W5 Class | Bogie, drop centre combination, built by MMTB (1935–1939): 35 | 720–839 |
| SW2 Class | Bogie drop centre saloon, built by MMTB (1938, 1953, 1955): 37 | 275, 426, 432, 436, 478, 644 | |
 | SW5 Class | Bogie, drop centre saloon, built by MMTB (1939–1940, 840–849), converted by Metropolitan Transit Authority (1983–1986, all the other tram cars) | 681–682, 721–734, 736–750, 752–755, 757–760, 764–765, 767–770, 773, 775–777, 780–781, 784–791, 793, 796–797, 800, 802, 805–812, 814–816, 818–819, 824, 828–830, 834, 836–838, 840–849 |
 | SW6 Class | Bogie drop centre saloon, built by MMTB (1939–1951): 40 | 850–969 |
| PCC class (1950) | Two door bogie saloon, built by MMTB (1950): 42 | 980 | |
.jpg) | W6 Class | Bogie, drop centre saloon, built by MMTB (1951–1955): 43 | 970–979, 981–1000 |
.jpg) | W7 Class | Two door bogie saloon, built by MMTB (1955–1956): 42 | 1001–1040 |
| W8 Class | Bogie drop centre saloon, converted from SW6/W6/W7 trams 946, 959 (2013), 957 (2015), 1010 (2016), 983 (2017), 856, 928, 961 (2019), 888 (2020) | 856, 888, 928, 946, 957, 959, 961, 981, 983, 1010 | |
 | X class | Single truck saloon safety car, built by JG Brill Company & St Louis Car Company (1923): 22 | 217–218 |
| X1 Class | Single truck saloon, built by MMTB (1926–1928): 28 | 459–468 | |
 | X2 Class | Single truck saloon, built by MMTB (1930): 30 | 674 (later 680), 675–679 |
 | Y Class | Bogie saloon, built by MMTB (1927): 29 | 469 |
 | Y1 Class | Bogie saloon, built by MMTB (1930): 31 | 610–613 |
 | PCC class (1973) | Prototype two door bogie saloon, last ever tram built by MMTB (1973). Formed the basis of the Z1 class tram design | 1041 |
 | Z1 Class | Two door bogie saloon, built by Comeng (1974–1978): 13 | 1–100 |
 | Z2 Class | Two door bogie saloon, built by Comeng (1978–1979): 13 | 101–115 |
_in_Swanston_St,_December_2013.JPG) | Z3 Class | Three door bogie saloon, built by Comeng (1979–1984): 16 | 116–230 |
_in_Bourke_St,_December_2013.JPG) | A1 Class | Three door bogie saloon, built by Comeng (1983–1985) | 231–258 |
 | A2 Class | Three door bogie saloon, built by Comeng (1985–1987) | 259–300 |
 | B1 class | Articulated saloon, built by Comeng (1984–1985): 19 | 2001–2002 |
 | B2 Class | Articulated saloon, built by Comeng (1987–1994) | 2003–2132 |
 | C Class | Three-section articulated saloon, low floor Alstom Citadis 202 tram (2001–2002) | 3001–3036 |
 | C2 Class | Five-section articulated saloon, low floor Alstom Citadis 302 trams (2008) | 5103, 5106, 5111, 5113, 5123 |
 | D1 Class | Three section, low floor Combino trams, made by Siemens (2002–2003) | 3501–3538 |
_in_Elizabeth_St_on_route_19_to_City_in_PTV_livery,_December_2013.jpg) | D2 Class | Five section, low floor Combino trams, made by Siemens (2003–2004) | 5001–5021 |
 | E Class | Three-section, four-bogie articulated trams built by Bombardier Transportation based on the customised Flexity Swift product (2013–2021) | 6001–6100 |
.jpg) | G1 Class | Three-section, low floor trams based on the customised Flexity 2 product, built by Alstom (2023–) | 7001–7100 |
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