On the way back from Richmond Station at the weekend we went up this bank:
https://www.google.com/maps/@54.4038427,-1.735088,3a,75y,357.36h,72.91t/data=!3m6!1e1!3m4!1slJ7UPKMsmYYpl_u57Va3-g!2e0!7i16384!8i8192?entry=ttu
Just after the bend we heard a really loud bang. A bang I've heard before...