I use the South West Trains personal timetable service because it provides a "whole day" option, giving a practical way of getting a timetable for journeys to and from stations / on lines where the population is too small for the local
TOC▸ to provide a decent service, such as the Swindon - Chippenham - Melksham - Trowbridge - Westbury service, with no departures between 06:15 and 18:45. On such lines, personal timetables that offer a 4 hour (or even half day) option as their widest range are near-useless as you have to know what sort of time the train actually runs in order to ask at what time the train actually runs

Thanks for that tip Graham, I'll use them in future. Even on more frequent routes than Coombe to Combe, sometimes I just want to see trains for the whole day to help me decide what time I'd like to travel.