Perfect for a gently activity with grandparents in tow, this would pass maybe an hour or two, perhaps breaking up a long journey.
It's signposted off the A30 between Exeter and Launceston, and it's £7 for adults and a fiver for children, but under-3s are free.
Bring a picnic as there are benches and a nice area to sit outside the museum itself. There's also a cafe and the cakes looked divine.
Train spotters paradise inside the museum, as you take in engine after engine - my son was open-mouthed most of the time. It didn't take too long to get around though, and then we had a few goes on the dodgems (lovely vintage ones, not just any old dodgems!) which was roughly £1 a go, and three goes was enough.
Special events here are centered around weekends and include a carol concert at Christmas time.
There's a small gift shop, here, too.