The Edinburgh/Glasgow 'Lowland' sleeper is formed of 16 coaches and the longest passenger train in the UK, with the rear half being split off at Carstairs which goes to Edinburgh.
The Aberdeen/Inverness/Fort William one is I believe 14 coaches. 6 to Aberdeen, 6 to Inverness and 2 to Fort William. At Edinburgh, where it splits, the lounge car and seated sleeper coach are attached to the two berth coaches to run on a normal passenger train (by which I mean you can buy Edinburgh to Fort William tickets for it in the seated sleeper) and leaves at 0450. Going to Fort William as far as Edinburgh, passengers are required to share the seated sleeper portion of the Inverness sleeper where a change is required.
Going the other way is virtually exactly the opposite.
Traction wise, it's 90s from Glasgow/Edinburgh to London and on the Aberdeen/Inverness/Fort William to London after Edinburgh. From Edinburgh to Aberdeen, Inverness and Fort William it's all 67s these days.
Hope this helps!
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