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.
Head boilersmith Mark and his fiancee Emma choose their beloved B1 steam train to lead their wedding, but not everything goes to plan.
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.
It is War Weekend at the North Yorkshire Moors Steam railway, a celebration of the part the railway played in WWII - and almost 30,000 visitors are expected. In a packed weekend,the railway is transported back in time to 1939.
Piglet acquires a 92 Squadron engine for the Steam Gala, but steam superfan Steve has another task for the classic RAF-themed machine.
Under pressure to bring in extra revenue now that the season is nearly over, the NYMR team decide to put on a massive bash for Halloween. Perfect time for all the lights to blow out.