Railwalks.co.uk is aiming to create a national network of walks from and between railway stations, downloadable from this site.  We are working with Slow Ways, who are building a national network of walks between settlements.  In many cases, those walks start and finish at a railway station, as you can see on this map.  

Our supporters have begun submitting their own walks, which you can see here.
In the meantime, we have found dozens of websites with hundreds of walks from and between UK railway stations, already available.  We have arranged links to them all by region and nation below: