ScotRail passengers are being warned that journeys over the Christmas period and into the new year will be hit by national strike action.
Network Rail members of the RMT union will be walking out on the following dates:
The strikes are part of a long-running dispute over pay, job security and conditions.
The action will cause disruption to ScotRail services, as Network Rail Scotland signallers and maintenance staff, who are in safety-critical roles, will be involved.
On Christmas Eve, services will run as normal until around 3pm, when they will begin to wind down.
David Simpson, ScotRail's service delivery director, told the BBC: "It's really disappointing to see more disruption across the whole Great Britain rail network as a result of the dispute between Network Rail and the RMT at a time when we need to be encouraging more people back to the railway.
"We know this is really frustrating for everyone impacted and we're urging customers to plan ahead and check their entire journey in advance."
- RMT trade union general secretary Mick Lynch has held secret talks with Network Rail bosses amid hopes that he will sue for peace in the new year as public support for train strikes crumbles.
Mr Lynch and his deputy Eddie Dempsey met Network Rail's representatives in a hastily-arranged meeting yesterday morning, reports the Telegraph.
The pair are believed to have met with Network Rail lead negotiator Tim Shoveller and HR head Pauline Holroyd at the state-owned company's offices on Eversholt Street, London.
It is understood that both sides have now agreed to a fresh round of negotiations in the second week of January.
Whitehall sources seized on the top-secret discussions, which were not official negotiations, as fresh evidence that Mr Lynch is under growing pressure to strike a deal.
One insider said the two sides are discussing a "goldilocks deal" in which each can declare victory.
They added: "Lynch is now looking for a way to get out without losing face."
A poll by YouGov showed that support for striking rail workers was significantly lower than that enjoyed by nurses. Around 43% of people support the RMT, with 49% of respondents opposed to the union. This compares with 66% support for nurses and only 28% opposition.