Sketch of the Great Historic Mines of the Cerro De Proaño at Fresnillo: State of Zacatecas, Mexico. E-book. Formato PDF Benjamin Silliman   -  Forgotten Books, 2017  - 

The opening up of Mexico by the railway system was an event not contemplated by M. Duport in 1843, or he certainly would have included so important a factor, which is destined (to use his comparison) to bring about the result he foretold a century earlier.