Drive a Stanier Black 5 Between Mallaig and Fort William (please note there is very little ai in this scenario with only 3 ai trains, and you’ll have to wait for them at Mallaig, Arisaig and Glenfinnan, you’ll also have to switch the points outside Mallaig once the other train pulls in, just press G when it’s stopped)

Requirements (very little)
Steam
BMG Black 5
LMS 4F (for wagons)
LNER K1
West Highland Line Extension

CW
CR 944 Class

AP
MK1 Pack
Sky and Weather EP