Supporters travelling to the Betfred Scottish League Cup semi-finals at Hampden Park and BT Murrayfield Stadium are being advised to plan their journeys in advance.
Celtic play Hearts in the 1.30pm kick off at BT Murrayfield on October 28, while Aberdeen travel to Hampden Park to face Rangers at 4.30pm on the same day.
ScotRail has confirmed that extra carriages will be added to trains to help fans get to and from the stadiums, however trains will be much busier than normal.
Aberdeen supporters are encouraged to consider their travel options, as the three trains to Glasgow prior to kick off and two trains back to Aberdeen after the match are expected to be very busy.
Customers heading to the games are advised to allow additional time for travel, as queuing systems will be in place at Glasgow Central and Queen Street prior to kick off.
They will also be in place at Mount Florida/Kings Park and Haymarket after the final whistle.
Extra staff will be on hand to assist customers and alcohol bans will be in place.
ScotRail Head of Customer Operations Phil Campbell said: “These are really big games for the teams involved, and we’re looking forward to once again helping fans get to the match to cheer on their side.
“We will be doing everything we can to keep people moving hassle-free, but supporters should plan their journeys in advance at scotrail.co.uk or on the ScotRail app.”