Episode 3

On its first gentle hill, the tiny train grinds to a halt. Bearing in mind the monster hills that it must still face, this is alarming. But one of the train team has a brainwave... Further ahead near Fort Augustus, Claire has come across an impassable rocky stream. After a conference with her team, they decide to build an ambitious curving trestle bridge. But the train doesn't look like it will make it that far. It keeps falling off the track, so Dick drives into the nearest town to see if he can manufacture a bespoke tool that will stabilise the track. After six days of non-stop building everyone's getting tired so they reward themselves with an exuberant birthday party for one of the team members, led by Lawrence the DJ.