From the clapperboard on the screen this mystery film was made on t16/5/83 and intended for Tomorrows World Using a model railway layout it appears that the functioning of full sized railway signalling equipment is being demonstrated to the customers of the full sized railway presumably Nigerian Railways . Presumably this was a simulator . Whether this was to train the future signal man or for the client to approve and accept the equipment before dispatch is not clear. Much of the film is several takes of the same action by the “signalman”.
It seems to be based on a single line to Kajuru with token working. Included is a miniature signal frame so they can pull off signal or points although the scheme seems to include colour light signalling at what presumably is a passing point on the main line. An emergency is simulated with a cow on the line. Late a delightful 12 lever signal frame in in miniature is operated with fingertips which appears to represent a station layout which presumably was not being modified . The frame has all the necessary interlocks.
Spliced in is a faded to red film of a different model layout with more rolling stock then back to modern colour. It then reverts back to some cameral tricks filming the rolling stock in such a way you cannot get any clues to relative size.
As well as railway signalling the film gives a great insight in the patient camera work that is needed before the presenters needed to get involved to explain the action on Tomorrows World . I suspect most railway modellers would be most struck by the old style signal frame miniaturised. 25 minutes mostly in good colour.