The Skitube is an electric rack railway which provides access between Bullocks Flat, Perisher and Blue Cow ski fields. The journey starts across the bridge over Thredbo River, then covers a distance of 8.5km, of which 6.3km is underground in the Bilston and Blue Cow tunnels. Construction of the railway began in 1984, and the complete line was officially opened in 1988. There are 11 passenger cars in total, of which 4 are motor cars - each with four 301 kW traction motors, making them the most powerful rack railway vehicles in the world. The braking system is mixed regenerative and rheostatic. Prices are around $48 for an adult return fare. Schedules vary throughout the year.