You are very welcome.
For future online map reference, I also find the Library of Congress Map collections, davidrumsey.com and historicmapworks.com to be very useful.
Here is a link to the Albemarle County Historical Society's posting of a 1907 map of Albemarle County confirming that the entire length of the road does appear to have been known as Sand Rd.http://albemarlehistory.org//index.php/library_maps
The special collections library at UVA is the Albert and Shirley Small Special Collections Library at the University of Virginia. It is located adjacent to the main library, Alderman Library and also next to Clemmons library. All are just west of the Rotunda on the grounds of UVA. A quick check of the catalog also shows a collection of records from the Nelson and Albemarle Railroad which was owned and operated by the soapstone companies. Perhaps they have records for other railroads or for the Woolen Mills?
Here is their website:http://small.library.virginia.edu/
By the way, the Woolen Mills neighborhood area is still known by that name and I believe is now an official historic district.
Also, it appears that in the same area as the Albemarle Soapstone Company was located, on the earlier 1907 map, that area is identified with the Old Dominion Soapstone Company. A quick check of google maps for that area shows many of what from above look like small lakes, but are actually abandoned quarry pits that are now filled with water and are sometime swimming spots as they are very deep.
Good luck in your searching,