I'm modeling that line, but just the Spencer to Clinchcross portion. I've found the "Business Tracks and Stations Not Shown in Station Columns" in the employee timetable to be very helpful.
Also, look at the county GIS web sites. The one for Catawba County is particularly helpful, with very easy access to deed history which sometimes tells you who used to own the property in question.
Tim Rumph
Lancaster, SC