I was in St Ives for the first 2 weeks of August. I'm used to going there in holiday seasons and it being busy, but it was really busy.
Observing various webcams around the town over the last few days it appears to be nearly as busy as we approach mid-Sept, so not surprised the trains are still busy aswell.
A good thing for the town and the local economy
(as long as people are sensible). When we were there most of the hospitality venues we visited were observing the rules and managing things well. The caravan site we use, especially well (which was one of the main reasons why we were happy to go).