Aslef, the rail union, has been rocked by the formation of a breakaway union.

A right-wing faction has created the Associated Train Crew Union (ATCU).

Steve Trumm, who helped to found the new organisation, said: "ATCU has been set up as a result of the turmoil of the past few years which has caused massive concerns among train drivers."

Aslef has been hit by power struggles and the resignation of its general secretary in recent times.