Which examples of towns are there which don't have their own railway station, but are close enough to one already that the cost of building one probably outweighs the benefits?
For example, Melrose is a 30-40 minute walk from Tweedbank, so probably won't get a station back unless the route at least as far as Hawick is reinstated (and current Waverley–Tweedbank journey times are timed to be 60 minutes a lot of the time; does that make timing any easier?), and Hythe (Kent) is a ~40 minute walk from Sandling.
For example, Melrose is a 30-40 minute walk from Tweedbank, so probably won't get a station back unless the route at least as far as Hawick is reinstated (and current Waverley–Tweedbank journey times are timed to be 60 minutes a lot of the time; does that make timing any easier?), and Hythe (Kent) is a ~40 minute walk from Sandling.