I hadn't realised there were only 4 Glasgow-Aberdeen, raised to 5 in 1974. Back when the A4s were doing the best services, there were certainly far more.
I don't think the TT varied much in the A4 era but latterly the trains were:
ex Buchanan St 08.25*,10.00, 14.05, 17.30* and 23.00 - those marked * were the three hour trains calling Stirling Perth Forfar and Stonehaven only, and were shadowed by stoppers between Perth and Aberdeen in both directions. (The 23.00 ran ahead of the Inverness overnight train).
From Aberdeen 07.10*, 09.30, 13.30, 15.30, 17.15*.
The 15.30 was the Up Postal, with TPOs detached front at Perth and forward ahead of the Buchanan St portion. When Buchanan St and the Forfar route closed this and the 23.00 disappeared from the TT (I recall a spell when the Postal conveyed passengers only between Dundee and Perth although the coaches came from Aberdeen), and the 23.00 was replaced with the 01.05 from Perth (and conveyed a van from GLQ detached at Perth off the Inverness).
This left just 4 trains each way (plus as before a number of connections at Dundee (off the xx.10 from GLQ) although over the years times varied e.g. from Queen St in the early seventies 08.10, 13.10, 17.05 (off pattern to accommodate a Dunblane 'peak' stop - and probably also to avoid cl40 on 8 coach timings being caught by the following 17.15 push pull (2x27 with 6) peak extra) and 18.10.
Then a 15.52 (or similar) was added as the Clansman connection in May '74, and a bit later the 10.10 to Dundee was extended to Aberdeen (but remained a cl27 working whilst the others were all 40 or 47 worked), perhaps in part as it's 'normal' back working from Dundee was now filled by the Clansman connection.
To add to this (nothing to do with the Clansman but in the context of A4s), in my mid primary school years my Aunt and Uncle farmed at Carmont and when visiting several times a year my vantage point for observing A4s, Black 5s, miscellaneous diesels and occasionally A2s and A3s was a five minute walk down a forestry road then down a firebreak through the then infant trees to a point overlooking the bridge over the Carron Water above and opposite the 221 milepost. When this location so tragically came to national attention last year I immediately realised exactly where it was. Such happy memories brought back to mind by this terrible event.
My vantage point is hidden by the plume of steam in the attached, with the forestry road alignment visible above. The 221 milepost is the white dot to the left of the third/fourth coaches.