I spoptted this in the Gaurdian too.
Website seems to be a 'one stop shop' for links to external sites with (uneven) inf on walks from various GB railway stations, I was hoping for something a bit more interactive, with mapping and routes plotted, perhaps that's a next step.
'Railwalks', not to be confused with 'railway walks' along old trackbeds

which is my preference really (
https://www.railwayramblers.org.uk/), or riding old railways...
Anyway, anything that encourages more folk out on the trains and on the footpaths the better!