The Chinnor and Princes Risborough Railway is holding its annual open day at Chinnor Railway Station tomorrow (Saturday).
The event runs from 10am to 3pm and entry is free.
There will be free train rides along the line and visitors will also be given the chance to see behind the scenes and talk to the volunteers.
Chairman Roger Fagg said: “Our railway is celebrating its 20th year of operation with special events and extra running days - including midweek trains for the first time.
“We are delighted to give visitors a chance to visit the railway for free this weekend.”