Hundreds of workers at Scottish bus manufacturer Alexander Dennis (ADL) are to launch a wave of strikes, after rejecting a pay offer.
The union Unite said about 400 coach builders and spray painters would stage industrial action from today until Friday.
A second round is due to start on October 3 and last until October 14.
The company, which has bases in Camelon near Falkirk and Larbert, said it was disappointed that the action was going ahead.
According to the union, the firm's latest proposal was a 4% rise from April to October, which would then increase to 6.6% from October.
Unite said the offer represented "a significant real terms pay cut" in the face of rapidly-rising inflation.
It highlighted ADL's order book, after the company won contracts to manufacture 172 green buses through a second round of the Scottish Government's £40.5million Scottish Ultra-Low Emission Bus Scheme.
Direct talks for months
Unite industrial officer Pat Egan told the BBC: "Unite has engaged ADL in direct talks for months now to find a resolution to this pay dispute.
"However, despite having a very healthy order book, the company refuse to make our members an offer which their world-class work deserves.
"Our members have been forced by the company to take this strike action and they will continue to take action until the company sees sense."
A spokeswoman for ADL said: "This action comes despite our sincere and best efforts to reach a fair and reasonable agreement."
The firm was acquired by Canada-based New Flyer Industries (NFI) Group in 2019.