Heatherslaw Light Railway, at Ford and Etal Estates, is holding 25th anniversary celebrations on Tuesday.
Managing director Paul Smith, whose father Neville helped start the railway, will be on hand at various times through the day to talk with visitors and answer questions.
The day begins with a VIP train for invited guests at 10am. From 11am, the normal schedule of trains will follow, with both steam locos running alternately. The new diesel, currently under construction, will be on display.
There will be party decorations and a treat for younger passengers. Call 01890 820244 for details.