Was sent a link to another film clip on this site , but started searching & came across this lot , which may be of interest .
ssa.nls.uk/film/1962 , this is about construction of A 9 , with footage of a 141 , a few F 86s , & some older stuff involved in construction .
ssa.nls.uk/film/1820 , about the river Forth & its surroundings , with shots of coal mining , Grangemouth Docks with Russell of Bathgate & Forth artics on dockside with containers , also includes a drive by of Bathgate , looks to be still BMC .
ssa.nls.uk/film/7174 about construction of Ravenscraig steelworks with Pickfords ,& local hauliers
All films are approx 25 mins or so long , but are well worth a look 
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