The TRIANG HORNBY X518 4-6-2 A1/3 CHASSIS with green wheels and silver seal is a model railway part made from white metal, plastic, and steel. This chassis is compatible with the A3 Flying Scotsman model and is designed to run on OO gauge railways. The green colour of the wheels adds a realistic touch to the overall look of the train. Ideal for collectors and enthusiasts looking to enhance their model railway setup, this Hornby chassis offers both quality and authenticity.