Varies 2/3 refurbs in service and 8/9 classics but the diagrams are completely impossible as they change daily now the only ones I could guarantee a HST on are the
0707 Glasgow to inverness
1102 Inverness to Inverurie
1714 Inverness to Inverurie
0845 Inverness to Glasgow
1508 Glasgow to inverness
1842 Inverness to Edinburgh
Everything else is very hard to predict
A friend says the 0928 Edinburgh to Aberdeen is often a HST as well as the 1602 Aberdeen to Edinburgh. Sound right?