Train operators Southern, Thameslink and Gatwick Express - all part of the Govia Thameslink Railway franchise - urged passengers not to travel on Wednesday morning 'if at all possible'.
The video, captured yesterday, showed the food delivery rider come to the rescue of desperate passengers stuck on a Thameslink service heading for Brighton.
Kam Zaki, 47, was one of the 1,800 commuters who were stranded on the Thameslink services which had passengers feeling like they were being 'slow cooked' in 'an oven'.