The line along
La Trobe Street between
Spencer Street (Stop 1) and
Brunswick Street (now
St Vincent's Plaza) (Stop 12) was opened by the
Melbourne & Metropolitan Tramways Board on 15 January 1951. Until 1972, trams running the La Trobe Street shuttle usually ran without numbers. Route 30 was first allocated to the line between
City Spencer Street to via
La Trobe Street on 25 September 1972. On 19 June 1973, a siding was installed just east of St Vincent's Plaza in order to allow
route 12 and route 30 trams to shunt out of the way of through-running trams. Route 30 became peak-only following this point. Route 34 was discontinued from regular service on 19 September 2003, and replaced by new off-peak services of route 30 which began on 21 September 2003. As part of the
Docklands redevelopment project, tram tracks along La Trobe Street were extended west over the
Spencer Street railyards in 2000. On 30 November 2003, the off-peak services of route 30 were extended via the La Trobe Street extension,
Harbour Esplanade and
Flinders Street before terminating at the
Market Street intersection. On 4 January 2005, off-peak services of route 30 were altered to terminate at
Waterfront City along Harbour Esplanade and Docklands Drive, with the opening of the Docklands Drive tram extension. Peak hour services continued to terminate at Spencer Street. Between May and November 2005, all route 30 peak hour services were temporarily extended and terminated at Waterfront City, to replace a truncated section of
route 48 between Central Pier and Waterfront City. During this time, the latter temporarily terminated at
Market Street due to the closure and removal of the
Flinders Street Overpass over
King Street. The temporary arrangement ceased with the completion of works in November 2005. On 28 July 2008, route 30 swapped termini with
route 86, with all peak and off-peak services terminating in Harbour Esplanade at
Central Pier, while route 86 was extended to Waterfront City. On 1 January 2019, the operation of route 30 was extended to evenings and weekends for the first time. During special events such as the
Australian Open or the
Australian Grand Prix, route 30 does not operate. Instead,
route 12 temporarily diverts via La Trobe Street and replaces route 30. The temporary cessation of route 30 and diversion of route 12 was also in place between 13 July and 7 November 2020, as part of a
COVID-19 response plan to increase overall capacity in the city which introduced shuttle services of
route 11. When route 30 recommenced operations on 8 November 2020,
E class trams commenced operation on the route. ==Route==