The B type Adelaide tram was a class of 30 straight sill, open cross-bench trams built by Duncan & Fraser, Adelaide in 1909 for the Municipal Tramways Trust (MTT).

Although popular in summer, they were less so in winter when exposed to inclement weather.

When the MTT introduced an alpha classification system in 1923, they were designated the B type.

The A2s were used exclusively on the isolated Port Adelaide network.

This article about rail transport in South Australia is a stub.