Actually, the A-tractor class was introduced to replace the original EPA-tractors, but after protests the existing EPA-tractors remained although no new EPA-tractors can be registered.

A-traktor - Wikipedia		A tractor - Wikipedia
Den principiella skillnaden mellan EPA- och A-traktorn är att A-traktorn måste vara konstruerad för en maxhastighet av 30 km/h +/- 10% medan EPA-traktorn skulle vara konstruerad med ett visst utväxlingsförhållande (10:1).		The principal difference between the EPA and A tractor is that the A tractor must be designed for a maximum speed of 30 km /h /- 10%, while the EPA tractor would be designed with a specific gear ratio (10:1 ).

A-tractors are often called EPA-tractors too, so your Norwegain cousin was almost right.

A vote for PES is a vote for EPP! A vote for EPP is a vote for PES! Support the coalition, vote EPP-PES in 2009!