The Belmond British Pullman arrived at Ashford International at 07:00 GMT as passengers waited for a London train.
The train, dating back to the 1920s, is the sister of the Venice Simplon-Orient Express.
Travel firm Belmond put on the service to treat commuters on a 90-minute journey through Charing, Maidstone, Otford and Swanley to London Victoria.
Some of the passengers had registered for the journey after seeing a social media campaign, while others had a surprise upgrade.
The train is usually reserved for leisure travellers on trips to major sporting fixtures or for special events, such as an afternoon tea hosted by Great British Bake Off's Mary Berry.
Gary Franklin, managing director at Belmond, said: "We wanted to sprinkle some magic on the rails and do something that reminded people just how wonderful train travel can be when you have the luxury of time."
Commuters on the service were treated to a three-course breakfast and musical entertainment.
Tamzin Crook, 41, said: "I turn up every day, stand in the same spot and wait for the same train.
"The standard experience is to fight for a seat and then put your head down and read.
"Here, it's like something out of an amazing film. It's opulent. It feels like we're going on holiday, not to work."
'Come on board'
Nathan Charlton, 25, and his fiancee Alicia Ray, 26, said they were running late for their train and saw the Pullman from the car park.
"We spoke to the staff and they said 'You're more than welcome to come on board'," Mr Charlton said.
"The only problem is that we'll want to do this every day."

Clwyd West Tory MP David Jones said he backed proposals for "English votes for English laws" but it was important to define clearly what those issues were.
He said many of his constituents used public services in England and many voters there relied on Welsh hospitals.
The UK government said it was bringing about constitutional reform to serve people living in all parts of the UK.
The House of Commons rule changes would also limit some votes to English and Welsh MPs only.
Speaking during a Commons debate on the Queen's Speech, Mr Jones said of the policy: "I strongly approve of that commitment, since it will restore fairness that has been eroded in the wake of the 1999 bout of devolution.
"However...I say that we should treat that proposal with caution and what is most important is that defining what are English or English and Welsh issues is of paramount importance."
Mr Jones said many of his constituents used hospitals in the north west of England.
"The people of north Wales have an absolute right to expect that that their representatives in this place should be able to speak in this House on those issues that concern them."
He added: "I would say to my right honourable friends on the front bench that this is extremely important if the fairness that we seek to achieve by creating by English and Welsh votes for English and Welsh laws, or English votes for English laws, is not to be brought into disrepute."
Business Secretary Sajid Javid said: "As a one nation government we will revise the rules to make the law-making process fair - bringing about constitutional reform that serves people living in all parts of the United Kingdom.
"The introduction of English votes for English laws will do just that for England."
He was challenged by Delyn Labour MP David Hanson, who said he represented a part of Wales that uses English hospital services, transport, employment and airports.
"I want to know from you, why I can't speak or vote on those issues," he said.

Sam Boulton, 26, was hit by a van at about 13:20 BST on 27 July on London Road. He later died in hospital.
Leicestershire Police said a 50-year-old man was questioned and released.
The road was closed between Station Street and the entrance to the station but later reopened. Police have appealed for witnesses.
In a statement, Mr Boulton's father Jeff said: "We would like to thank you all for your kind wishes, love and support for our beautiful son, brother and fiancÃ©. We are asking you to respect the privacy of both families during this sad time."
Commuters were given a surprise upgrade when a luxury train arrived for their daily journey to work.
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