Rail passengers have been warned they may face some travel disruption due to hot weather in the coming days.
While temperatures in Scotland are not expected to soar as high as south of the border they could still reach up to 30C in some areas this week.
ScotRail said that high temperatures can pose challenges for the railway as steel rails expand as they heat up in direct sunlight.
It warned that temporary speed restrictions may be put in place on some routes to ensure services continue to operate safely, which could lead to slightly longer journey times and, in some cases, minor service alterations.
Mark Ilderton, ScotRail service delivery director, said: “As temperatures rise across Scotland this week, we’re encouraging customers to take a few simple steps to help ensure they have a safe and comfortable journey.
“Staying hydrated, checking your journey before travelling, and speaking to a member of staff if you feel unwell can all make a big difference.
“Hot weather can also create challenges for the railway, and there may be occasions where temporary speed restrictions are introduced to maintain the safe operation of services.
“We encourage customers to plan ahead and check for the latest travel information before setting off.
“Whether it’s carrying a bottle of water, looking out for others, or asking for help when it’s needed, small actions can help keep everyone safe.”
A red weather warning of extreme heat is in force in parts of southern England and Wales on Wednesday and into Thursday.
North of the border, forecasters predict that temperatures could rise as high as 30C in parts of western Scotland on Thursday before cooling down over the weekend.
Ross Moran, Network Rail Scotland route director, said: “We know hot weather can sometimes affect how the railway runs.
“That’s why our teams are keeping a close eye on conditions and carrying out extra checks across the network to keep services moving.
“We’re not expecting the same extreme temperatures as elsewhere in the UK, but we’re prepared for warmer weather and ready to act if needed.
“We’d encourage passengers to check their journey before travelling and take care in the heat.”
