This bridge crossing the main railway now stands isolated behind Dockside Road and the back of the South Tees Motor Sports Park which covers the location of the Cargo Fleet Ironworks
Its inaccessible from either end, presumably to stop vandals throwing things onto passing trains as crossing wouldn’t actually get you anywhere.
Dave Walsh then quickly posed an interesting question about whether this was actually the bridge that carried the Cleveland Railway to the Normanby Jetty, to which I didn’t know the answer. Looking at the 1894 map there are actually two adjacent bridges, the northern one going to the Cargo Fleet Wharf and the southern one going to the Normanby Jetty used by Bell Brothers to transport ironstone to their works at Port Clarence.
The 1915 map appear the show the southerly bridge gone, leaving only the remaining one to the Cargo Fleet Wharf, but i’m by no means certain of all its functions over the years so any additional information would be welcome.
Update : Simon Chapman has kindly shared a 1972 photo of the bridge with me. In front of the bridge on the right can be seen the remaining parapet of the Cleveland Railway bridge to Normanby Jetty which was subsequently demolished. On the left of the photo is Normanby signalbox which controlled the junction for mineral traffic into Cargo Fleet Works.