How many routes could actually have a viable 24 hour service ? The Thameslink route is probably the only real 24 hour service in the country with an hourly service from around 01:00 to 04:00 apart from Saturday night Sunday morning and it is well patronised with standing room only on certain trains.
There used to be all night services to Southend and to Hertford North and Stevenage at a time when the St.Pancras-Bedford daytime service was just an hourly DMU. What is it that makes the all-night service viable on the Thameslink route yet not on others?
The line from Paddington to Reading has an almost 24-hour service, with the biggest weekday gap between trains being 1.5h London-bound and 2h the other way.
