ScotRail customers are being urged to check their journey before travelling, ahead of expected late cancellations during industrial action.
It comes as members of the Rail, Maritime and Transport union (RMT) are set to follow instructions to not work any overtime amid a pay dispute with the operator.
The RMT rejected ScotRail’s latest pay offer of a 5% basic pay increase, a six-year job guarantee, a one-off £500 payment for technology such as mobile phones and improved maternity leave conditions.