The early 1920s ushered in a new era for Britain's intricate network of railways. Amalgamating dozens of small companies into a system monopolised by the "Big Four - the LNER, the GWR, the SR and the LMS - the Grouping Act implemented in 1923 transformed the way that the nation travelled. This box set of maps surveys and describes the four new routes, as well as their construction, operation, and the iconic express trains that served them in the days of steam. . CLICK HERE TO DOWNLOAD THIS BOOK FOR FREE