"After the war, work started on building a fast railway connection between Warsaw and Berlin for transporting equipment and labor resources to the newly discovered limestone quarries in the eastern part of Poland. The Oder Bridge was built where the railway crosses the Oder river, which used to form the border between Germany and Poland. It was one of the first bridges built using super-concrete."
There is a small historical inaccurancy in the description. In Wolfenstein's timeline the Oder river never formed the border between Germany and Poland, due to the nazi victory in World War II. This is because in reality the border was far to the east from the river. That is until the German defeat in 1945, when the borders were redrawn in Potsdam (see Oder-Neisse Line).