The typical London & South Western Railway signal consisted of a lower quadrant arm on a lattice post, with a cruciform finial and round-case lamp, supplied by Stevens & Co. Post-Grouping, the Southern Railway modernised many of these signals by replacing the arm with the upper quadrant Westinghouse type. A square-case lamp was fitted at the same time. This type of post was also used for new installations and renewals until the advent of rail-built posts in the 1930s. Some examples remain in use today.
By substituting the finial for MSE’s SC0017, an ex-LCDR signal may also be modelled.