 From June, the route was extended from Majorstuen to Tordenskiolds plass via Neuberggata, Tidemandsgate, Magnus Bergs gate, Thomas Heftyes gate, Bygdøy allé, Drammensveien and Karl Johans gate.Line 21 opened on 25 June, running from Dælenengate and Colbjørsens gate to Waldemar Thranes gate, Bislett and Josefines gate.The new routes required 18 more similar buses from Strømmens Værksted.