About 800 professional transit workers, who have not walked out yet, are set to begin an overtime strike in the latter half of the month and into next year after their union filed formal notice amid stalled contract talks.

The Union of Professional and Office Employees, Local 610, whose members include workers like engineers and architects, said in a statement members will refuse all overtime from Dec. 17 until Jan. 11.

It follows 91 per cent of members voting in favour of strike action earlier in November.

The union and the Société de transport de Montréal (STM) must now agree on which duties must be maintained as these workers fall under essential-services rules. Quebec’s Labour Tribunal will decide whether that list is sufficient.

In the statement, Benoît Tessier, union vice-preside

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