Workers on Arriva Trains North have started voting on whether to launch a campaign of industrial action in a dispute over the role of guards.
Members of the Rail, Maritime and Transport (RMT) union are being balloted in the latest row over staffing on the railways.
More than 1,200 union members will be involved in the vote, which closes on February 28.
RMT general secretary Mick Cash said:
A company spokesman said:
