https://www.famoustrains.org.uk/
Quote from their website:
Watch the model trains go by – learn about our railway history and how railways operate – keep dry when it rains in the Park! This is a Derby-based charity working to improve the local community by providing entertainment and education in an enjoyable way.
A generous benefactor, Derek Chandley, gave us his 40 foot-long model railway. This is an 00-scale layout based on Chinley station in Derbyshire in the 1950s when it had four main line tracks running through it. We have extended the model railway to almost 60 feet in length. It has storage loops for 16 full length trains so that visitors can see plenty of variety. Visitors may see the progress made when they make repeat visits. We open on 150 days each year, principally on weekends and Mondays.
Visitors can watch a succession of model trains go by, and can see what happens at terminals, goods yards and on the main line. There will be much, much more. Look through this web site to discover our world of fun!
N.B. Please check opening times before travelling