Don't worry, each way is painstakingly retraced throughout the length to make sure no trace exists. This follows the wiki's guidance as well as DWG guidance. Oftentimes these features are glued to actually existing features, so mapping with them can be quite painful. Rails-to-trails projects require remapping the area due to the geometry of the trail not matching an approximation of a rail that may have existed in the area, so having them does not save time in the future.