Thanks, that's interesting but I take it that's always on straight level track.
It is only a slight exaggeration to say the every station served by EMR Inter City South of Leicester is on a curve. Curves have cants, which mean the train is tilted when standing at the station.
When the 170s were introduced and I caught them at Wellingborough on the Up they often had door close problems. On one occasion of total failure, everyone was transferred to a following HST and I found myself sitting opposite a man with an 'Adtranz' name badge reading documents headed 'Adtranz'. I thought it reasonable to politely ask what the problem was with 'Adtranz' doors and he gave the answer as being when on the tilt, and '26 door sensors'.
Who am I to say, but perhaps repeatedly opening and closing on a straight, level siding in a factory or depot may not be as testing as at Kettering on the down fast, where the 810 I was on had problems. Wellingborough has an even steeper cant, but no 810s call there - at the moment.