History
From croft to neighbourhood
The croft under Nordre Skøyen
The name comes from a husmannsplass, a crofter's holding, under the farm Nordre Skøyen. The croft itself is gone, but an old apple tree in a garden in Hellerudfaret is taken as a sign of where it stood.
Nordre Skøyen still stands in the north of the district. The farm is listed, and its 18th-century farmhouse rests on a medieval stone cellar.
A resting place on the way to town
The Oslo city encyclopedia (Oslo byleksikon) reads the name as an instruction: «tra opp», roughly "walk on up". The croft may have been a place where people and horses rested on the road through Østmarka towards Christiania, as Oslo was then called. The same name appears elsewhere in Oslo, including crofts under Bjølsen and Smestad.
The streets get their names
Trasoppveien was named in 1933 and Trasoppterrassen in 1944, both spelled with a double p and both named after the croft.
OBOS builds
Aker merged with Oslo in 1948, and the first homes followed soon after. The housing cooperative OBOS built two- and four-family houses in 1948 and 1949, known as svenskehus ("Swedish houses"). Most of Trasop is still terraced houses and small detached homes.
School and sports park
Trasop school opened in 1958 and got new buildings in 1961 and 1963. Temporary barracks stood in the schoolyard for about 30 years. From the early 1980s until 1998 the school was merged with Godlia. Later came Trasop sports park and the hall now called Oppsal Arena.
Between two districts
Trasop has never followed administrative lines. From 1973 the area was split between two districts. In the 2004 district reform Trasop became part of Østensjø, and the street Trolldalsveien became the boundary with Alna.