At 825 perfectly straight yards, Prospect Tunnel channelled the Harrogate to Wetherby line under Follifoot Ridge at Rudding Park. Just beyond the northern portal was Crimple Junction where the line joined the existing Leeds to Harrogate line. The mainline just beyond the junction crosses the impressive 31 arch Crimpel viaduct.
The line was built by the York and North Midlands Railway in 1848 and was an early casualty of the Beeching cuts in 1964. Sub Brit visited the partially flooded tunnel in 2008, by special permission of the Rudding Park Estate.