Signal workers in the Stirling area are balloting for strikes in their dispute with Network Rail management over rosters.
The workers want to move to 12 hour rosters. A recent referendum conducted by the RMT union saw 15 to 1 support for this move among the signal workers.
Ballot papers were sent out on Wednesday of last week. The ballot will close on 18 April. The RMT union is urging a vote in favour of industrial action.