Railway signallers are planning a second day of strike action after walking out in a dispute over rosters.
The Network Rail workers at Stirling station began a 24-hour stoppage on Thursday morning.
According to the National Union of Rail, Maritime and Transport Workers (RMT), the action comes after talks broke down over plans to introduce a three-day working week compromising 12-hour shifts.
Network Rail rejected the proposals, claiming it would leave the organisation with too large a cost burden.
It also claimed services were running as normal in the area on Thursday. Union officials have dismissed claims that the roster changes incurring extra costs as “bogus”.
The RMT said the second day of action would take place in two weeks' time.