GM-Gruppen is a Norwegian heritage railway society that restored and operated Scandinavian diesel locomotives from General Motors Electro-Motive Division (GM-EMD).
The first locomotive acquired by the society was a G12 unit number 7707 from the Swedish Statens Järnvägar (SJ).
It was built in 1953 in London, Canada and sold to SJ and numbered T42-205 as the sole G12 used by the company.
In 1989 GM-Gruppen agreed to buy two Danish MX/MY units from Danske Statsbaner (DSB), numbered MY-1104 and MX-1040.
All rolling stock was sold or returned to the owner after GM-Gruppen lost their operating licence.