After behaving themselves for a few weeks (even during the heat-related speed limits), the trains are all over the place today. So far, I've made three journeys. East Croydon to Kings Cross Thameslink -- train broke down at Farringdon. I don't know how long it was stuck there, because after five minutes I gave up and took the Underground instead. Euston to Leighton Buzzard -- fifteen minutes late due to a track fault at Bletchley. Leighton Buzzard to Euston -- most services cancelled, and the one I was on overcrowded and fifteen minutes late because of a fatality at Harrow & Wealdstone.