The following text is from the original listed building designation:

GILLINGHAM
TQ76NE GILLINGHAM PORT GATE 686-1/7/59 Chatham Dockyard 14/08/92 Semaphore signal, Gillingham Dockyard Railway
II
Semaphore signal. c1885. Cast-iron. Bi-directional signal protecting both a road crossing and the Chatham Dockyard Branch railway (opened February 1877). Approximately 20 feet high, tapering, with a red and a white arm controlled by hand levers, attached to the base of the post, which can move the arms through 3 positions, with colour discs and a circular lamp for night signalling. HISTORY: thought to be a unique survivor of this early form of semaphore signal, which though probably erected for the railway, is similar in its working principles to the Naval Semaphore telegraph used since Napoleonic times to link the coast with London. (Journal of the Signalling Record Society: January: 1992-).
Listing NGR: TQ7697568044
(1)

Demolished in the 1990s.

Railway signal 80m north of Gillingham Gate at side of Dockyard railway. Its finial is typical of the form adopted by London, Chatham and Dover Railway Co. (1)

<1> English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.

<2> Untitled Source, Victor Smith Feb 1997 (Unpublished document). SKE6451.