One of the biggest events on the NYMR timetable is the annual War Weekend. The event, which sees the whole railway transformed into a nostalgic snapshot of wartime Britain, is hugely popular with steam enthusiasts, war re-enactors and others fascinated by days gone by. Coming towards the end of the railway's season the event is vital to bring in much-needed funds to see it through the quiet winter months. For its 20th year, the railway has brought in a new attraction - a huge Second World War artillery gun. However, getting the monster gun into position proves a mission in itself.

The August bank holiday coincides with a heatwave and in the old carriage kitchen, Sammie swelters with 100 meals to prepare and serve, while on the loco footplates the boiler kicks out an extra 1,000 degrees of heat. A trackside wall collapse threatens to stop the railway in its tracks, though a curious group of volunteers called the Wombles comes to the rescue, working through the night to get it fixed. Elsewhere, Piglet comes up with a money-spinner by sending one of the locos, little Engine 29, to another railway.

The annual steam gala is held and this year, in a bid to generate as much cash as possible, the railway decides to put on a show with a record 15 locos coming from all over the country for a weekend steam spectacular. The star-studded line-up includes the iconic Union of South Africa. This engine, a sister to the Mallard, the fastest steam loco ever built, is due to be retired, so this will be one of the last opportunities to see it. However, Piglet is optimistic for a home win with the 9F, the last remaining example of one of the most powerful class of engines ever built in Britain.

Paul Middleton, aka Piglet, and the team attempt to finish the restoration of a 9F locomotive that has taken more than 50 years, and also bring the monster King Edward IV engine to the branch line for its gala. It cost a small fortune to transport there, and Piglet doesn't know if the huge engine will fit on the small branch line. Plus, the programme meets Beth, the railway's first female loco driver, and follows Gill and Sammie on the Pullman dining train for their last afternoon tea service of the season.

The return of the behind-the-scenes look at the North York Moors Railway. Piglet's been promoted, but seems to spend more time in his overalls than behind his desk as he grapples with an old American war-horse, the S160 Omaha. Elsewhere on the railway, lovable ticket inspector Bert Blower has a new trainee, and `king of the carriages" Kieran awaits a Flying Scotsman carriage returning to the railway after being vandalised two years earlier. Plus, there are antics from trainee driver Phil and budget-conscious big boss Chris.