A view of the River Greta looking upstream from the bridge carrying the path created on the trackbed of the dismantled Cockermouth, Keswick and Penrith Railway.
The bridge seen in the distance is Calvert's Bridge, possibly built in the 19th century and listed, grade II, with details at:
Link
A four mile long footpath was created by the Lake District National Park Authority between Threlkeld and Keswick though the Greta Gorge. Three bridges on the footpath were damaged or destroyed in the winter 2015 floods and are still (in 2019) in the process of being repaired.
The Cockermouth, Keswick and Penrith Railway was 31½ miles long with eight intermediate stations and opened in 1864. The section from Keswick to Cockermouth was closed in 1966 leaving Keswick at the end of a single line branch from Penrith which survived until 6th March, 1972.