Trains between Ashford and Dover were suspended on Monday when cold weather disabled the electric rail.
Some commuters at London Victoria faced lengthy delays until Tornado - Britain's first mainline steam engine in 50 years - offered them a lift.
They were taken home "in style", said the Darlington-built engine's owners.
Train services in Kent were hit hard by the freezing conditions at the start of the week.

If any operators want to modernise their services by using steam trains, I would be happy to give them a quote Mark Allatt, A1 Steam Locomotive Trust

The weather-related disruption included three days of cancellations for Eurostar services through the Channel Tunnel.
Tornado, a £3m Peppercorn class A1 Pacific based at the National Railway Museum in York, was in the South East for one day, offering "Christmas meal" trips from London to Dover.
Its "Cathedrals Express" service, the last mainline journey in its first year of operations, was about to depart when staff heard about the stranded passengers.
About 100 people were offered free seats, according to Mark Allatt, chairman of The A1 Steam Locomotive Trust - the charity which built Tornado.
'All credit'
He said: "It was a nice way to finish for Christmas, though I think some of the rescued passengers didn't realise they'd even been travelling on a steam train until they got off."
Mr Allatt, who was on the service at the time, said he only saw a handful of other trains between London and Dover throughout Monday.
He added: "If any of the train operators want to modernise their services by using steam trains, I would be happy to give them a quote."
A spokesman for Southeastern Trains congratulated Mr Allatt on his "moment of glory".
He said: "I'm sure those passengers were saved from a lengthy wait, all credit to him."