Mark Rollins – Model Railroading By delabs | January 8, 2009 - 11:47 am |January 8, 2009 Home Projects Mark Rollins – Model Railroading Model Railroading – model railroad information, complete with model railroad circuit diagrams. Electrical Circuits you can make! With 3D wiring Sketches, easy for the beginner. Tagged Model-Railroading. Bookmark the permalink.