sold as seen wear and tear ty. The Hornby R900 Power Control Unit is a DC speed controller designed for use with Hornby Railways OO gauge model trains. Made of plastic and with a wattage of 250W, this pre-built unit is compatible with both analogue and DCC control systems. The model control unit is ready to go and provides the power needed to operate your model railway trains with precision and ease. Perfect for collectors and enthusiasts looking to enhance their train layout, this Hornby control unit offers reliable performance and control for your miniature trains.