I first visited St. Bees back in 1985 when undertaking a survey of the Cumbrian Coast route from north to south. The box is a charming design and is in a delightful location. It's a Furness Railway Type 3 box dating from 1891 and is Grade 2 listed by Historic England so its future is secure when eventual closure comes as the line is modernised. The Historic England's citation is quite impressive and can be found at....
https://historicengland.org.uk/listing/the-list/list-entry/1412068?section=official-list-entry