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Well, SJ, the government operator started with the Y6 family of DMUs for standard, 1435mm, track gauge, these were built by AJS, Hägglunds, Kalmar verkstad and Märstaverken.
Then Hilding Carlsson built the Yp variant (for narrow gauge 891mm) of the Y6 family.
...and then came Valmet with its Dm6.
And nobody paid anything for the intellectual property. The history of these railbuses is fascinating in how it's a chain of betrayals.