A blast from the past!
Items posted on the Memories of Middlesbrough (and other similar sites) Facebook page by Ben Reche. I vaguely remember them as still being in operation when my interest started in 1960 (although I could be wrong!!) but I do not recall seeing any of their vessels, if they were still running them by then. Corporation Dock is adjacent to the Transporter Bridge, now the new location of the Tees Harbour Office, based in the former Fire Brigade building.
Ron