It allows for higher capacity on the metro as more passengers a transported via the Ring Line instead of through the congested Common Tunnel.

Løren Station is estimated to receive six thousand daily passengers, making it among the ten busiest on the metro network.

[7][8] Oslo Sporveier announced in 2005 that it planned to double the number of services on the Grorud Line, to eight per hour.

However, the bottleneck of the system is the Common Tunnel through the city center and services on all branches of the metro are limited by the capacity of that line.

With the Ring Line under way, planners started to look at how it could be used to increase traffic flow and capacity of the metro.

[9] An alternative or supplemental proposals has been to use the Alna Line as a cross-town services of the Oslo Commuter Rail.

[12] Planning of the Løren Line is part of a wider concept of building additional rail-based services across Groruddalen.

[3] The contract for the ground work of the line was awarded by Sporveien to Skanska on 13 May 2013 and had a value of 357 million Norwegian krone and construction commenced in June.

[14] The lower parts of the Grorud Line was closed from September through December to allow construction work on the connection.

[15] The Ring Line from Sinsen to Carl Berners plass is similarly proposed closed from June 2014 to March 2015.