The Great Northern Railway began installing somersault arm concrete post signals in 1918, following their earlier use on the M&GN. After the grouping, the LNER modernised many of these signals by fitting upper quadrant arms and a new lamp, and used this revised design for both new installations and renewals until the advent of tubular steel posts in the mid-1930s. Some examples are still in use on Network Rail today.

The kit can be built as a home or distant signal in any height up to 25ft.

The kit is designed for soldered construction, but Araldite or superglue can be used in places, particularly if the finished signal is not intended to operate. Some simple marking out, cutting and shaping of parts is required. To see exactly what is involved in constructing this kit, download the instruction sheet as an Adobe Acrobat® file (122kb).