the engineers of the auckland electric tramway company, bet company designed their own tramcars, earlier models were built by brush engineering in loughborough, construction post the great war was exclusively by auckland coach builders and increasingly the tramway's own workshops at royal oak on manukau road. rear entrance dinghy "a type" four wheelers, and toast rack trams were trialled in the early years and a small number of c type double deckers used until the 1920s. the "combo" or b type design pretty much laid the basic design of auckland tram down from 1902. entrances at either end, platform steps within the bodyline of the tramcar. the in-house design progression moved to the addition of windscreens, a separate motorman's compartment from the m type in 1908 and a seat design and layout for 52 seated passengers that remained standard until closure in 1956. dalliance with riveted steel construction with the art deco "semi-steel" n type in the 1920s which included butterfly [double set] destinations set in a v shape which could be read even when trams were parked bumper to bumper, double set saloon doorways a return to traditional wooden construction with the 1929/30 big cars with minor improvements to seating design and finally the 1930s streamliner design, which had curving pillar frames, 7'6" over the chassis and 8' at the window sill level and reducing again to the roofline. the design change of the bodies was cosmetically pleasing, but still seated only 52 passengers on wooden seats. six of the streamliners used emb trucks imported from the uk, primarily where they were used under double deckers. the remainder used brush improved trucks, a design little changed for 30 years which were the mainstay of the auckland fleet.