mo FAQ 3.1 Why does the centerline of the all tracks have to be 4 inches or more from the edge of the module?
This is for two reasons. 1) To protect models, if something was to happen and a train derails, we do not want the cars or engine to fall to the ground. It will be bad enough to have them on their sides. 2) For scenic looks. It looks better if there is scenery between the track and the edge of the module.