Welcome to ZugWare! We're in the business of providing utilities and other good stuff to the rail simulator community. Our first product is ReDem, a tool to quickly create terrain for the Rail Simulator Developments Rail Simulator from the highest resolution USGS data.
Check out the documentation and see how easy it is to quickly create large areas of accurate terrain for your route. ReDem allows multiple terrain resolutions per route, so you don't have to settle for low resolution everywhere if high resolution data is available for part of the route.