Described by actor Bill Nighy as "the Grand Duchess of Travel", the Northern Belle features distinctive umber and cream 1950s-style Pullman carriages and passengers are expected to dress up for the occasion as they board over a red carpet.
A spokesman said: “Jeans, T-shirts and trainers would definitely be frowned upon.
"The Northern Belle is a prestige train and travelling on it is a special occasion. So we do like our guests to dress accordingly.”
A seven-course lunch, prepared by onboard chef Matthew Green, will be served with wine during the journey to Llandudno on Sunday, September 26.
But those with a lighter appetite can opt to take afternoon tea with sandwiches, cakes, pastries, scones and petits fours instead.
The train, which is scheduled to depart Wolverhampton at noon, has its own resident musicians and a conjuror wanders from table to table doing "amazing tricks".
The Northern Belle will return to Wolverhampton on Thursday October 7 for a trip over the Settle-Carlisle line, hauled by crimson-painted steam locomotive Princess Elizabeth.
Channel 5’s “Most Scenic Railway Journeys” programme featured that journey earlier this year with Love Actually star Bill Nighy saying “Our plush grand tour has been the experience of a lifetime.”
There is also a trip planned for November 12 to visit the Christmas Market in the Hampshire city of Winchester.
Fares start at £210. For more details, phone 01270 899681 or see www.northernbelle.co.uk