....overall leaf drop had been relatively low until Angus arrived. The storm, plus the sudden change in weather it partly brought about, changed this situation effectively overnight. The result was an unprecedented level of leaf drop in a short period that seems to have quickly exceeded a level that the Piccadilly line’s mitigation could cope with. No doubt other factors than Angus will surface during TfL’s own investigation as to what has caused such an unprecedented level of rolling stock disruption on the line. That Angus and leaves have been such a factor, however, seems relatively clear....
. This way it doesn't hold up the Piccadilly line trains which could run on the slow line as far as Hammersmith.
