To celebrate its 50th anniversary, the railway has hired headlining steam engine Royal Scot, but she has a problem with her boiler, carriages that haven't been serviced in five years, and no-one even knows if she will fit the line.

The marketing manager targets teachers in hope they'll return with students, Chris reveals how some bridges are in desperate need of repair, and Piglet has a race against time to fix an engine which is hoped be on display for the Tour de Yorkshire.

The busy summer season is looming and the steam engines are old, so there's always something to fix. The only chance of getting through the summer is if they complete the overhaul of Repton, a 1934 Schools class engine.