Midland Railway Type 2B Signal BoxO Gauge Midland Railway Type 2B Signal Box including interior detailing pictured here. History of the Type 2B Signal Box: The Midland Railway created its own signal box design in about 1870. The first version, the Type 1, had small windows on three sides, the Type 2 appeared in 1884 and had large windows in the front. This kit is based on a 15ft Type 2B, which was first produced in 1892. They differed from the Type 2A in not having a post between the