Well, this has been a struggle, but I think I have finally identified Car #8, the small 4-wheel steering transporter, as a Trenkle A52.
The link is obviously with Place L, the magnificent viaduct, and this is the Mintarder Brücke, which crosses the Ruhr valley near Mülheim in Germany, and which forms part of the A52 autobahn running between Essen and Düsseldorf.