(now known as the Onehunga Line) was one of the first Government funded railways in New Zealand, being opened in 1873. It was built by the Auckland provincial government. Industry started to flourish in the area from the 1920s, due to its close connection to the main railway line and the main road (Great South Road) with these important transport links later strengthened by the motorway (State Highway 1) built following the same alignment in the 1950s. By this time, around 5,000 workers were employed in the suburb.} The new motorway and the move of industrial and manufacturing occupations out of older centres like the Auckland CBD soon started a boom in the Penrose-Mount Wellington area. Industry also successfully lobbied for state housing to be built close by, to provide the new area with a supply of labour. To this day, the area remains almost exclusively industrial, with a mix of run-down areas and newly established sites. Education Despite the low local population, Penrose is the site of the former Penrose High School, which in 2008 renamed itself One Tree Hill College, to shed the 'industrial' associations of the name. The school attracts many students from out of the suburb, many of its students coming from as far as 20 km away. The school is coeducational and has a roll of as of The Auckland Japanese Supplementary School (AJSS; オークランド日本語補習学校 Ōkurando Nihongo Hoshūgakkō), a Japanese supplementary school, holds its classes at One Tree Hill College. Sport and recreation Penrose is home to the New Zealand Warriors, who are based at Mount Smart Stadium. References External links Photographs of Penrose held in Auckland Libraries' heritage collections. Suburbs of Auckland