The Chuggineers are busy constructing a new station. Brewster gets under everybody's wheels until Zack lets him take the welding wagon away to practise with. Down an old, disused line, Brewster finds lots of old junk to weld together. Koko persuades him to go exploring along an overgrown track.

They cross a dried-out stream bed and the rusty track collapses behind them, leaving them stranded. They both need to get back - Brewster has to return Zack's welder wagon and Koko has a passenger run. Suddenly Brewster realises that he might be able to mend the track by welding it. Although he's inexperienced, he does a solid job, and they cross back over just as Zack comes looking for them. Show less