I thought they just mix and match depending on general demand? Aberdeen has always had 4 x sleepers from what I remember.
Don't know the coach letters off by heart, but I'm positive this is the Highland Sleeper Formation out of Euston (in order: rear to front)
1 x Mk2 Seated [Aberdeen]
1 x Mk2 Lounge [""]
1 x Mk3 Sleeper (D)
3 (or 2) x Mk3 Sleepers [""]
-----------------------------
1 (or 2) x Mk3 Sleepers [Fort William*]
1 x Mk3 Sleeper (D)
-----------------------------
1 x Mk2 Seated [ Inverness]
1 x Mk2 Lounge
1 x Mk3 Sleeper (D)
5 x Mk3 Sleepers
-----------------------------
1 x Loco [Edinburgh]
The Southbound sleeper is the exact same formation. The potions from Aberdeen and Fort William equate to 8 on arrival at Euston, so form the Inverness portion Northbound.
*1 x Mk2 Lounge & 1 x Mk2 Seated coupled (N/B) and uncoupled (S/B) at Edinburgh
(D) = Accessible berth & Accessible toilet
I'm positive that Inverness is at the rear. It's the first departure from Waverley so having it at the rear avoids unnecessary shunting. The Inverness seats are also coach A which suggest they're at the rear (rather than midway through).
Edit: I see you've edited in the time it took me to reply; I was off looking for evidence to back up my view!
Last edited: