S1·E17 Super Magnet

When the water tower falls across the train tracks at the station halt, it's Pat's job to pick it up using his helicopter and a giant super magnet. The Magnet soon starts attracting objects - Alf's spade, PC Selby's hat, Pumpkin's bridle, from all over Pencaster and Greendale. A chase ensues as Amy, Alf and PC Selby race to get their metal objects back from Pat. Pat needs to save the day and lift the water tower off the tracks before the Pencaster Flyer comes into the station...