One of Freightliner's 'Super Sheds', 66624 passes Harrowden Junction on 21 April 2010 with the 6M54 12:30 Thorney Mill to Bardon Hill stone empties. With a maximum tractive effort of 105,080 lbf, the Class 66/6s are not quite a match for the Class 59s (113,550 lbf), but considerably better than a standard 66s paltry 92,000 lbf.