Irish Rail have apologised for "ruining a day out" after Dart passengers forced open the doors and and walked along the tracks to the Bray Air Display on Sunday.
Thousands of people were travelling on the DART to Wicklow when delays to the services meant that trains stopped outside Bray as they waited for a clear platform.
But passengers travelling southbound reported waiting on the trains in the heat without air conditioning, open windows, or enough information on how long the delays would be.
