Identification & quantity of components on fret:
1. 5ft home (5) and distant (1) arms
2. Spectacle plates for 1 and 7 (8)
3. Backlight blinders (8)
4. Balance lever brackets (8)
5. Balance levers (6)
6. Rodding guides (6)
7. 3ft home arm (1)
8. Goods/slow line rings (2)
B. Calling on arms (2)
SN4 2mm scale London & North Western Railway lower quadrant signal arm fret
This fret represents the corrugated steel type of signal arm introduced by the London & North Western Railway in 1883. They remained in use through the LMS period and into BR days, but all have now been replaced by upper quadrant (SN12/2) arms, often on the original posts, or by colour light signals.
The actual size of the fret is 42 x 27mm; it is etched in 0.008" brass. For clarity, the photo shows the equivalent 4mm scale fret.
To see exactly what is involved in using these parts, download the instruction sheet as an Adobe Acrobat® file (115kb).