Basically the government put up much of the financing but gave a private company monopoly on traffic until 2040. It was sold to venture capital which because of

Basically the government put up much of the financing but gave a private company monopoly on traffic until 2040. It was sold to venture capital which because of tax planning are paying little to no tax. The Wikipedia article is fairly complete. https://en.wikipedia.org/wiki/Arlanda_Express https://en.wikipedia.org/wiki/Arlanda_Express