The book is aimed at a wide range of people who need to know more about S&C; be they designers, maintainers or others involved in the infrastructure or operation of a railway network. The various configurations are covered which include the range of switches and common and obtuse crossings made up of built, welded and cast manganese derivatives. S&C designs are continuously changing and being improved but the basic principles remain the same. This book was written by experts in 2001 and revised in 2018.