Underground space is an important parameter when negotiating on the railway network of the future for more housing, a better labor market and sustainable travel. The National Negotiation on Housing and Infrastructure is working to ensure that Sweden, as soon as possible, builds its first high-speed railway for trains travelling at 320 km/h. The initiative will lead to increased housing construction and growth in many municipalities and regions along the new railway routes. This is a negotiation on co-financing which is focused on the benefits and in which municipalities, regions, towns and cities and the business sector can all participate and influence the result. Using negotiation as a working method creates the greatest possible benefit for the funds invested by all parties and leads to increased efficiency and more rapid implementation.