The collection of books of "Monografías del Ferrocarril" is Lluis Prieto's publishing initiative that takes as a purpose the diffusion of the historical aspect of our railroads with great rigor and informative abundance. The collection, always increasing, began in 1994 with the book The Transpirenaico of the Noguera - Pallaresa and the F.C. Lleida - Teruel - Baeza. From January, 2001 also we are present in Internet, with a web where they can consult the details of every book and even acquire them on-line.