TRNSMT is making a comeback on Glasgow Green, meaning people will be travelling from around the country to see some of music's finest acts.
The day time festival will take place over three days, with ticket holders travelling to and from the event each day.
It means that public transport is likely to be busy, especially at the beginning and end of each day.
However, Scotrail workers have been striking every Sunday since April 28, meaning very limited services have been running.
Last trains have often been hours earlier, with slower and less frequent services.
The strikes were initially supposed to last until September 5, however a recent vote means that they will continue throughout the Autumn.
Here's what it means for your TRNSMT travel...
Are there ScotRail strikes on Sunday September 12?
Yes, there will be Scotrail strikes on Sunday September 12 after striking workers voted to continue.
The Rail, Maritime and Transport union (RMT) announced last week that 80% of Scotrail conductors had voted to continue the strike action until and including Sunday October 17 at the earliest.
Speaking on the decision, RMT General Secretary Mick Lynch said: "It the sheer pig-headed intransigence of Abellio and Transport Scotland which has forced us to continue this campaign of industrial action.
"I want to congratulate our members who have stood firm for over six months in this fight for pay justice and equality in the face of outrageous provocation from the employer.
"That fight continues and it is now down to Scotrail and their political masters to take this key group of staff seriously, to stop snubbing talks and to get round the table with the union to negotiate a fair and just settlement."
How will this impact my travel to and from TRNSMT?
If you were planning to travel by train to TRNSMT, you should make sure to check Scotrail's adapted timetables thoroughly.
You can find more details about which services are running here.
If you have already bought a ticket that you now need a refund for, you can apply for one here.
Scotrail said it would issue travel advice for TRNSMT early next week.
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