About the show
Gareth Griffiths is Sarah and James's granddad. He's a retired train engineer and driver and has recently left the city to be closer to his family. He is fascinated by the mechanical workings of everything and is keen to take things apart and see what makes them tick, or puff, or just plain roll! Unfortunately, Gareth does have a tendency to get flustered, which can lead to trouble. Gareth lives at the new train station.