Modeler's Moment - Elbow room

When you're planning your model empire, look at the places on your layout where you plan to have a lot of switching (the yards and heavy industrial areas). These are the places where your operators will congregate, so leave enough room in the aisle that they can get by each other. Sometimes it will require curving a yard around a corner, like you can see here. Believe it or not, this photo is from an operating session at a home layout.