The viewpoint here is the overbridge in Langton Court Road, St. Anne's, Bristol, looking towards Newbridge Road on the morning of Tuesday 07 September 2021. The cutting here was formerly the site of Bristol No. 1 Tunnel. In this scene Class 66 loco no. 66051 operated by DB Cargo leads 6M15, the Tytherington (0707 hrs) to Calvert loaded stone working. I watched this train pass through Bristol East Yard and the loco seemed to be struggling with the load, moving slowly and leaving a filthy trail of diesel exhaust behind it. As the train entered the cutting it met the early morning backlight, and this, together with the diesel pollution, combined to produce the atmospheric haze seen here.