One of the most common questions operators ask on a layout is "Where am I?" The builder forgets that he knows where every town is in relation to every other point on the railroad, but it may not be terribly obvious to a visiting operator.
I'm still tweaking these - but this is the one that's mounted in front of Everett. Note the direction arrows on the "station sign" - as you look at the layout "North" is always to your right. It also shows the names of the tracks, the car capacity, and the locations and names of the various industries, along with any specific car spots within that industry. Ultimately these will also include street names for grade crossings, and trackside facilities like water towers, stations, and the like.