Railway engineering

Railway engineering is a multi-faceted engineering discipline dealing with the design, construction and operation of all types of rail transport systems. It encompasses a wide range of engineering disciplines, including civil engineering, computer engineering, electrical engineering, mechanical engineering, industrial engineering and production engineering. A great many other engineering sub-disciplines are also called upon.
History.
With the advent of the railways in the early nineteenth century, a need arose for a specialized group of engineers capable of dealing with the unique problems associated with railway engineering. As the railways expanded and became a major economic force, a great many engineers became involved in the field, probably the most notable in Britain being Richard Trevithick, George Stephenson and Isambard Kingdom Brunel. Today, railway systems engineering continues to be a vibrant field of engineering.
Professional organisations.
"In the UK:" The Railway Division of the Institution of Mechanical Engineers (IMechE).
"In the US" The American Railway Engineering and Maintenance-of-Way Association (AREMA)
"In the Philippines" Philippine Railway Engineers' Association, (PREA) Inc. 
"Worldwide" The Institute of Railway Signal Engineers (IRSE)