Interesting video. I say its in the late 70s, before ANR logo's on the locos.
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I would say the ABC Film was recorded after September 1979 and June 1980.
I base this on Don River Railways Tender for DP22, PT3, ARR2, SSD2 and SS7 etc,etc being successful in September 1979.
DP22 & DP3 arrived at Don River Railway mid January 1980.
AAR 2 Arrived at Don after June 1980.
In the ABC Film there is a glimpse of AAR 2 under the Coaling Tower, It was under the Coaling Tower where we first started to needle gun AAR2 which interestingly showed up the colour scheme when it used to carry when coupled to the Sentinel Steam Rail Cars.
This photo shows PT3 and AAR2 on the Coaling Tower road which must have been after Dons successful September 1979 Tender and the items delivered to Launceston.