tassiebaz has posted some fantastic videos on his channel taken in Dec 1991 and Jan 1992 during the last days of standard red set operations. While the videos largely focus on the red sets, some U-sets can be seen in his footage. Considering the fact that there were far fewer U-sets built and there seems to be less footage of them, I have singled out the times in his videos which feature U-set services.
6:52 - shows U-set departing Hornsby railway station on a wet, rainy, dreary day with pantographs sparking brightly. The rear power car is one of the few with original lift windows and one of those that has survived into preservation.
11:30 - shows a 6-car Blue Mountains service U-set pulling into and departing platform 3 at Strathfield station
13:05 - 6-car U-set races through Strathfield station platform 2 towards the city
15:32 - U-set races through Croydon railway station heading west on the main down, overtaking a red set which flies through on the suburban (limited stops) down
The above last 3 scenes it seems were filmed at the same time as those taken by tressteleg in his u-set interurbans video, albeit from a slightly different perspective.
The following video shows the driver's perspective of a service going from Flemington to Wynyard
1:55 shows the train passing through platform 2 Strathfield station on the up while a U-set departs Platform 3 heading west.