66846 leads the 3S31 13:14 Gloucester Horton Road to Worcester Shrub Hill Rail Head Treatment Train past Bredon on 26 October 2017. Classmate 66848 is on the rear. Note that the train is not spraying, as a fault had developed with the equipment. This resulted in the train being put in the loop at Eckington, just over a mile further north, and then sent back to Gloucester via a reversal at Worcester, missing out the bulk of its diagram via Hereford and Craven Arms.