Either an interesting comparison between brand new and 1950s vintage diesel locomotive designs, or just very bad timing, depending on your point of view! 20081 & 20016 climb out of the Severn Tunnel on 27 April 1991 with the Class 20 Society 1Z40 08:40 Sheffield to Bristol 'Bristol or Bust' railtour, while 60010 waits its turn to pass through the tunnel with the 6B08 12:25 Langley to Waterston empty oil tanks.