There's a change of driver halfway at Crianlarich. Glasgow crews bring the 35-year-old Class 156 north, then wait to take over the next train back south. Crews from Mallaig, Oban and Fort William take their trains from the coast to Crianlarich and swap over. There's a tiny rest room on the platform, with a microwave and a sink, while they wait. Some drivers are signed all the way to the city. Most are not.
Source: wiktionary