It was supposed to be the start of their great Christmas Getaway.
But travel plans for thousands of people have been wrecked by rail failures.
Signal problems hit services into and out of Paddington Station and near Gatwick Airport.
Meanwhile, the AA has reported a surge in breakdowns in the capital - many of them flat batteries - as people leave their lights on when they dash to go shopping.
Here's Ronke Phillips.
More top news
The station, which saw 44m people commuters use it in 2016/2017, will be transformed into a dining room complete with Christmas decorations.
Part of the monster fatberg will go on display in the Museum of London, while the rest of it will be converted into biodiesel.
Major engineering projects at key London stations mean hundreds of trains will be cancelled or diverted.