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> SJ, a state-owned rail line launched in 2000

According to SJ's website the company was founded in 1856.

It would have been strange if Sweden only had railways since 2000.

Sort of. It was founded in 1856 as a government agency. In 2001 it was turned into a company with 100% of the shares owned by the government.

Additionally, it's not a "rail line". It's the largest train operator in Sweden.

Rail line is like airline but for trains, perhaps?