Trade union leaders have rejected a 4.2% pay deal, prolonging a dispute that has seen more than 700 rail services cut.
Aslef, which represents train drivers, negotiated with the newly-nationalised ScotRail last week, with organisers securing a pay increase.
But the union’s national executive committee decided to reject the deal on Wednesday, saying members would be balloted on industrial action should the operator refuse to come back to the table.
