ATW's 158831 has been signalled by Sutton Bridge Junction signal

box to take the Welshpool line on the bracket to the right of the train. It is just passing over the first set of points that takes it momentarily on to the down fast for it then head away from the Marches line to the west. The signal post to the left has a smaller horizontally striped subsidiary arm below the distant. This is necessary to give a driver special information about the section ahead. When off, a letter C (calling on), S (Shunt ahead) or W (Warning ahead-proceed with caution) will be displayed.