This new book is a sequel to Railway Signalling published by the Institution of Railway Signal Engineers. It details the many advances made in control technology since that time, particularly the development of Solid State Interlocking (SSI) which is now replacing earlier relay-based safety systems on British Railways. Also covered in detail are: modern methods of single line operation, level crossing control and train detection, as well as the immunization of safety systems against electrical interference. Changes in signalling principles and practices and in equipment and apparatus design, which have taken place since the first volume was published, are updated. Also included are chapters on train protection and passenger information systems. The book finishes with a review of future trends in railway signalling and control techniques and philosophy. Written by a panel of experts from British Railways and the railway industry, this book should prove useful to railway signal engineers and will also be of value to other engineers in the railway control field and to those in the signal equipment manufacturing industry.