Tie Basics 

Here are some areas with basic information about the Engineered Wood Crosstie Industry.
 

TieGuide

The TieGuide ya esta disponible en español

Producing and Inspecting Railroad Crossties (2004)

Basic Tie Information:

RTA Tie Defects Poster and Tree to Track Presentation

The RTA TieID Uniform Marking System for Crossties (2004)

Commonly Used Crosstie Species 

Engineering Principles Behind Tie Specifications:

Tie Life Manual