Train drivers at 12 operators are to strike on Saturday, November 26 in the long running dispute over pay, Aslef announced on Thursday.Members will walk out after the union said it was still waiting for a pay offer from the employers, despite a series of talks.The 12 companies facing the fresh strike are Avanti West Coast, Chiltern Railways, CrossCountry, East Midlands Railway, Great Western Railway, Greater Anglia, London North Eastern Railway, London Overground, Northern Trains, Southeastern, Transpennine Express, and West Midlands Trains.