Christmas on the Yorkshire Steam Railway

It's Christmas at the North Yorkshire Moors Railway, and cameras follow staff as they prepare for the festive season. In an effort to generate more winter revenue, a brand-new train, the Northern Lights Express, has been brought in, which features 25,000 lights fixed to a moving steam train. However, the staff are faced with a multitude of problems as generators break down, computers fail, and the engine that is pulling the new service develops a last-minute fault that threatens to stop the whole show in its tracks.