The iconic Ghan needs some bogies changed fast, a routine wheel lathe job hits a snag, plus an 80 year old steam loco climbs a mountain for a special anniversary.

The Spirit of Queensland's maintenance team race to change a bogie, the construction of a freight locomotive nears completion, and a breakdown crew hustles to get a commuter train back on track.

Skilled technicians battle with a stubborn alternator, a crew tackle a high-stakes engine rebuild for a freight train, plus it takes a team of experts to build a massive locomotive underframe.