Marc Perry, the fleet manager on the Piccadilly line, explains the issue with wheel flats, stating: "These markings on the wheels are caused by lack of rail adhesion. So as trains are running outside, if they go into the braking position and get low adhesion and the wheels lock - our trains don't have protection - and so they lock and start to slide. It's metal on metal and cause the flat."
Richard Jones from TfL emphasizes the need for new trains, saying: "The trains we are using currently on the Piccadilly line are 50-year-old trains. The systems that we have on them are very prone to getting wheel flats during what we call low adhesion conditions. The new trains that we will get, that we will be rolling out over the next few years, they have got those protection systems built in which will make them a lot less vulnerable to the whole issue of wheel flats."
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