50135 Ark Royal approaches Foley Park Tunnel on 4 October 2012 with the late running 12:01 Bridgnorth to Kidderminster service, during the Severn Valley Railway's Autumn Diesel Gala. After a sunny start, the clouds were rapidly building from the west, and shortly after this picture was taken the lights went out! Despite being slightly backlit, I think the combination of the bracken in the foreground, and the menacing dark clouds in the background makes an excellent picture.