Are there any other WMS servers for the US besides Terraserver? Because I'm trying to do Chattanooga-Knoxville (the NS line) and half of Knoxville is white like the map image isn't there. I was using a tiled topo map. Is there any site that can generate a regular street map (not topo or satellite) for you through TransDem WMS? The topo map is useless to me if half of Knoxville is blank. Why is part of it blank? Does that mean that the map data isn't available at that point? I checked Terraserver USA site itself and Knoxville is there, all of it. I also would like to do the NS line from Chattanooga to Atlanta as well and the TVRM route to Summerville, GA as well. Can someone help me with finding an error-free map source? Thanks. I also need a map source that shows roads, rail lines, rivers. It can be a plain street map.