the latter extended its Line 17 from that operated on the Homansbyen Line and the Vålerenga Line. Every other service was extended to Bryn and given the designation 7Ø. The original line was double track from Etterstadgata to the municipal border and single track onwards. It is now known whether there was a balloon loop or not at Bryn. Double track to Bryn was completed in 1925. Services were carried out with Class H trams. The ride cost 15 øre from Vålerenga to Bryn, and 30 øre onwards to the city center. Trams ran every 24 minutes to Bryn. Tramway operations Akersbanerne continued construction on the section from Bryn to Oppsal. The original reason for terminating at Bryn had been the prolonged construction of Bryn Bridge across the Trunk Line. The extension to Oppsal was completed in January 1926. By then KSS had been taken over by Oslo Municipality and merged to become Oslo Sporveier. However, the two municipalities and their tram companies could not agree on terms to lease the trackage from Etterstad to the city center. Part of the problem was the lack of a suitable turning loop with free capacity in the city center. Instead, Akersbanerne decided to operate the trams to Etterstad, where there would be transfer, without transfer tickets, between the two tram companies. For the operations, Akersbanerne bought four Class A trams and three trailers, which were built by Skabo Jernbanevognfabrikk and delivered in 1926 and 1927. This was not sufficient to operate all the lines, so an addition three trams were leased from Ekebergbanen. The lack of direct routes to the city center was not popular among travelers, and a direct bus service from the area around Hellerud was introduced. These was taken over by Akersbanerne in 1928, who subcontracted the operations to De Blå Omnibusser. Later the concession was given to the bus company. New negotiations between the tram companies were carried out, but neither party was willing to make sufficient admittances for agreement to be reached. Akersbanerne merged its operation to the west of the city center with Holmenkolbanen in 1933, and the Østensjø Line was the only remaining service they operated. Akersbanerne started negotiating with both Ekebergbanen and Bærumsbanen about either of them taking over the route. Bærumsbanen, that had become partially owned by Oslo Sporveier, had a similar suburban tramway to the east of the city center, the Lilleaker