The bi-directional signalling at work at Wolvercote on 10 August 2019. The red tail lights clearly show that 800312 is heading away from the camera in the up direction, on what is normally the down line. The train is the 1P75 17:45 Great Malvern to Paddington GWR service. A little while later it passed through Oxford station on the through line, then reversed back into the down platform, no doubt to the surprise of any regular travellers. It then continued southwards from the 'wrong' platform.