Blå Tåget is a Swedish progg-band with their lyrics cover a wide range, from marxist analysis and invitations to revolution to satire, art criticism, 1940s childhood nostalgia, images from daily life and experimental pop art works. Was called Gunder Hägg at the release of the first three albums.

They are best known for the song Den ena handen vet vad den andra gör, which was covered by punk band Ebba Grön (renamed Staten och kapitalet, with some of the lyrics omitted) and became a hit in 1980.

Torkel Rasmusson (vocals, accordion, harmonica), Leif Nylén (drums), Mats G. Bengtsson (keyboards, 1972-2005), Tore Berger (vocals, clarinet), Roland Keijser (saxophone, flute, 1972-73), Urban Yman (bass, violin), Kjell Westling (guitar, violin, winds), Carl-Johan De Geer (trombone, accordion, vocals)