Golden tickets winners get sneak preview.
The owners of a Golden Ticket will travel on three trains which will leave Tweedbank, Galashiels and Stow, each carrying 160 passengers.
Specially selected passengers are to take a trip on the Borders to Edinburgh railway a day ahead of its opening to the general public.
Others making the trip were nominated by the public or won competitions.
The 30 miles of new track between Tweedbank in the Borders and Edinburgh opens to the public on Sunday
The Queen will also carry out an official opening ceremony on Wednesday.
The route is the longest new domestic railway to be constructed in Britain for more than 100 years.