This LED head kit comes with a 3D printed head, LED and wire, and is based on the Great Western Searchlight Signals . This is a OO / 4mm scale product.
The Great Western Railway used colour light signals in several places on busy parts of the network. This followed the practice of twin arm semaphore signals with a home arm above a slotted distant, the searchlights displaying the same indication as would be shown by the semaphore spectacle plates. The signals are capable of displaying three aspects as shown above, Clear - proceed, the next two blocks are clear, Caution - proceed, the next block is clear but be prepared to stop at the next signal, and Stop.
While this signalling was installed by the Great Western in the 1930s it continued in use until after the demise of steam on the Western Region in the 1960s. Some of the Great Western signals were modified to the LNER style, notably on the main line out of Paddington near Southall.
For programming and further reading please see this link Signalist
Download Manual (PDF format)
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