Osterholz Class III Supply Point, Ludwigsburg (Source: Thomas Schulz, Germany) A railspur served the Class III Supply Point. Hidden somewhat in the trees (center) on the other side of the Osterholz Allee is the special railway gate that was used for allowing a train of tank cars (Deutsche Bundesbahn?) to enter the facility. The bottom photo shows a close up of the gate with one of the railroad tracks still visible.