This LED head kit comes with a 3D printed head, LED and wire, and is based on the LNER style 3-aspect mechanical searchlight signal. This is a OO / 4mm scale product.
The London North Eastern Railway used colour light signals in several places on busy parts of the network most notably they are still in use on part of the former Great Eastern section. The signals are capable of displaying three or four aspects, Clear - proceed, Advance Caution - the next two blocks are clear, Caution - the next block is clear but be prepared to stop at the next signal, and Stop.
While this signalling was installed initially by the LNER in the 1930s installation continued under British Railways and is still in use today at Clacton on Sea. BR Western Region modified some of the Great Western searchlight signals to be of this type too on lines out of Paddington. The latest signals which are currently being installed by Network Rail are the LED equivalents of the LNER searchlights.
For programming and further reading please see this link Signalist
Download Manual (PDF format)
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