Transit staff, after detailed scenario planning and extensive public consultation, produced the December 2012 "RouteAhead: A Strategic Plan for Transit in Calgary". A 30-year roadmap for public transit in Calgary, RouteAhead includes a long term vision for the CTrain system. The RouteAhead plan was submitted to Council and approved in early 2013. Existing Lines For the Red Line, in its 30-year RouteAhead plan, the South line may be extended another 3.5 km to a possible 210 Avenue SW station. For the Blue Line, from the same plan, there are more possible extensions to the northeast to either Calgary International Airport (via a spur line), or to 128 Avenue NE, or to have both. There are plans to build an additional line to the southeast from the city centre. Calgary Transit has drafted a plan for a transit-only right-of-way, known as the SETWAY (South East Transit Way) for the interim. A second, northern line is to be planned beyond 2023 but the alignment is still pending. As for a possible underground leg in downtown (under 8 Avenue South), the cost of the project will be at least C$800 million (in 2012 dollars), but its priority has been lowered because there is no funding available for it. However, the overall cost of this and other projects could be at least C$8 billion. Green Line This proposed future route would cross the downtown core at right angles to the downtown transit mall and connect two new legs: the Southeast leg and the North-Central leg. It would exceed the capacity of the downtown transit mall, requiring that it use a new right of way going over or under the existing transit mall. Elevated tracks would conflict with Calgary's downtown +15 system, which is the most extensive pedestrian skywalk system in the world, so this option is unlikely. Most likely the system will go underground, crossing underneath the future downtown subway, which already has a short section of tunnel built under 8th Avenue S and a ghost station under the Calgary Municipal Building. The exact routes and station locations are currently in the planning stages. Funding has been secured for the first stage of construction of the Green Line stretching from 16th Avenue North through the downtown core into the Southeast to the future Shepard Station at 126th Avenue SE. It is expected to be complete by 2026. The $4.6 billion cost of the project