Virgin Trains is refurbishing its First Class lounge at London Euston station.
Starting on January 31, the facility will undergo renovation for seven weeks before reopening on March 17.
Among the upgrades will be new interiors, more seats, "improved" wifi connectivity, an expanded range of food and drinks and a new business area.
During the works, Virgin will offer its First Class customers a voucher to use at "selected outlets" at Euston station that will entitle them to a hot drink and pastry or muffin.
Richard Shotton, Virgin Trains' stations major project director, said: "We will do everything we can to minimise the inconvenience to our customers when the First Class lounge is closed for upgrade works.
"In March, they will see a refurbished lounge with new interiors and more seats and I am sure they will appreciate the improvements."
Virgin's London Euston First Class Lounge first opened in April 1998.