This publication is the result of interest displayed by the scientific community in having a work that reflects the current state of knowhow related to railroad infrastructures. Its target audience includes professionals that conduct railroad infrastructure activities on a daily basis as well as those students wishing to educate themselves in this discipline. This is not merely a reproduction of existing knowledge on this subject but rather a structured and orderly publication reflecting an innovative criterion that, due to its originality and content, is of great interest to the railroad sector.