Bus drivers working for Stagecoach Merseyside plan to hold a one-day strike on Monday of next week.
The action will follow a solid four-day strike by the 350 Unite union members at the end of last month.
Engineers at the site have also begun a ballot—and hope to co-ordinate action with drivers in the future.
The drivers are fighting over pay. Bosses are trying to get away with paying drivers a 2 percent pay rise—despite the fact that the company made £126 million last year.
Some 81 percent of drivers rejected the offer.
Although the issue of pay sparked the dispute in Merseyside, workers are sick of what they describe as a bullying culture at the firm.
The union should name more strike dates now.