HAVING been constructed alongside the motorway over the previous six months, HS2’s Marston Box bridge was moved 165m (180 yds) into position over the M42 during the Christmas holidays – afeat that HS2 Ltd believes to be the “world’s longest box slide”.
A team of around 450 people from construction contractor Balfour Beatty VINCI (BBV) were involved in the operation, which took 40 hours to complete, at a speed of four metres (13ft) per hour.