This book is an essential introduction to the theory and practice of geotechnics in a railway trackbed engineering context in the UK. It gives the reader knowledge and understanding with practical experience and innovation on how the railway trackbed interacts with the track structure and the adjacent environment. The book is aimed at people new to the rail industry and also a guide for the more experienced railway engineers. Subjects covered in this book are: -Railway; -Trackbed design; -Track stiffness; -Trackbed failures; -Trackbed solutions; -Drainage; -Earthwork; and -Slab-track design. "This is a wide-ranging guide to the theory and practice of Geotechnics as it affects track engineering and should be welcomed by track engineers. It explores the underlying principles with scenarios associated with railway geotechnics mapping the growth of modern techniques, analysis and application." John Edgley CEng FICE FPWI President PWI 2020