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.