Network Rail has revealed that there was a case of trespassing on the railway every half hour on average in the year to 5 April, and that the total number of incidents reported was more than 19,300. Compared with the previous year, the number of accumulated delay minutes rose by 15 per cent last year, making trespass one of the biggest causes of late running. Trespass is almost twice as likely to happen during the summer months, because more than three out of five incidents were recorded then.