For the annual Gala Festival, the NYMR plans to swap their precious Q6 engine with another from the Severn Valley, but there is a crack in the engine box and no-one to fix it on short notice.

Head boilersmith Mark and his fiancee Emma choose their beloved B1 steam train to lead their wedding, but not everything goes to plan.

A summer heatwave brings record numbers to the railway, but also risks fires in the dry national parks through which the line runs, putting the very existence of the railway in danger.