This new volume contains historical data and photographs of every mechanical and heritage signal box to have survived into the 21st century on the national railway network. The first half of the book is divided into chapters covering each year from 2000 to 2018 with details of all the signal boxes that closed in each year. Includes the date of construction, commissioning railway company and brief histories and anecdotes for many boxes, plus interior and exterior illustrations. The second half of the book looks at all remaining signal boxes that were still in use in 2019, many of which will continue to see service for many years to come. Every box is illustrated, many with both exterior and interior views. An important and invaluable reference work. Essential reading for anyone with an interest in Britain's railways.