Belmond British Pullman Train

"Enjoy a quintessentially British Sunday Lunch aboard the vintage carriages of the Belmond British Pullman luxury train.
Anticipate a day of lifelong memories without ever leaving the train. Dress to impress and step aboard for a glamorous dinner with a renowned celebrity chef. Soak up the timeless atmosphere and raise a toast as you set off on a round-trip through the beautiful Kentish countryside.
Prepare to take a journey back in time as you relax into the sumptuous surroundings of the iconic British Pullman's Art Deco carriages. Embrace the very best of Great British traditions as you feast upon a sumptuous Sunday Lunch. Admire the intricate marquetry, woven brass luggage racks, gleaming crystal and silken lampshades that transport you to a more glamorous age, when to travel was more than just simply to arrive. Enjoy a glass of chilled champagne as the train journeys through the Kent countryside. As you watch the world go by, your steward will begin to serve a five-course Sunday Lunch, specially created by our talented chefs. To accompany your lunch perfectly, enjoy half a bottle of wine per person.
Includes
Round-trip travel aboard the Belmond British Pullman luxury train
Welcome champagne reception on board
Sumptuous five-course Sunday Lunch
Half a bottle of wine per person
Coffee, tea and petits fours

Departs at 11:05 Sun, 17 Oct 2021 from London Victoria
Arrives at 16:35 Sun, 17 Oct 2021 to London Victoria
Price from £435 per passenger"

Does not include a steam engine. Does go through some unsightly Medway Towns. Not sure which particular Kentish loop it takes after Faversham.
Here it is going over Luton Arches between Chatham and Gillingham.