Stevens & Co. supplied lattice posts to many pre-grouping companies, most notably those shown above. The SR also used them, until the switch to rail-built posts in the mid-1930s. They were also found in lesser numbers on the NER, LNWR, SECR, LYR, and the CLC, with the odd one or two on the GWR.
Posts of such height were used when it was desired to provide a sky background for sighting, or for visibility above a bridge or around a curve. Often, particularly for starter signals, the arm is repeated down the post at the driver’s eye level as it would be impossible to see the lamp or position of the top arm. The arms work simultaneously from one signal box lever and are termed co-acting.
The fret includes motion plates for centre-bearing lower quadrant signal arms. The jigs incorporated in the frets help to hold the parts together when soldering. If you require a shorter post, build it to its full height, and then cut it size afterwards. You will need to do this if using it as the base post for a bracket signal.
The actual size of the fret is 41 x 191mm; it is etched in 0.012″ brass.