For more information on many of the railroads like ownership, type and number of engines and cars, miles of track, etc., visit and consult:
Deyo, Dave – Well known researcher of the railroads of Puerto Rico.
Conocido investigador de los ferrocarriles de Puerto Rico. Ver / See Facebook – Historia del ferrocarril en Puerto Rico and other posts in this page.
Dunn, Richard. Baldwin and Vulcan Locomotives by Richard Dunn
Escudero, Jaime. “Centrales Azucareras de Puerto Rico.” Recinto Universitario de Mayagüez, Universidad de Puerto Rico, Web. 24 Sept. 2014. <http://blogs.uprm.edu/canadeazucar/>.
Long, W. Rodney. Porto Rico, Railways of Central America and the West Indies . Washington: Government Printing Office, 1925. Pag. 336. Print. (HATHI TRUST digital Library http://catalog.hathitrust.org/Record/000970279 (11 Oct. 2013))
Copyright: Public Domain, Google-digitized.
Railroad Map of Porto Rico (1924) / Mapa Ferroviario de Puerto Rico (1924)
Railroad map of Porto Rico. Map (39 x 89 cm, Scale [ca. 1:255,000]). United States. Dept. of Commerce. [S.l.], 1924. American Memory Map Collection. Library of Congress Geography and Map Division, Washington, D.C. 20540-4650. May 17, 2011 < http://hdl.loc.gov/loc.gmd/g4971p.ct000303>
USGS Historical Topographic Maps (Online) / Mapas Topográficos Históricos del USGS (U.S. Geological Survey)
With respect to the sugar mills, I only show in the maps the location of the factory. In various cases, the railroads of the mills extended to other towns.
All studies are subject to corrections and updates. There are differences because of various reasons. For instance, date of the research and resources available.