Two of the tracks are actually loops rather than running lines. They are needed to berth freight trains and ECS workings to allow these passenger trains to pass unimpeded.Not sure how long a stretch is required. certainly nowhere near the "Magistrale", but the section in Lincoln between West Holmes junction and the bridge over the River Witham has four tracks for about half a mile, and sees only three or four passenger trains an hour each way - one each to Nottingham, Sheffield, Kings Cross (every other hour, with some Newark Northgate shuttles in the gaps) and a handful to Doncaster