Chuggington Stack Track Working Wheels Set Brand new in box £15.00 Out of stock. Build up your Chuggington Stack Track train collection with the Working Wheels Service Yard Set. Roll up, ready to fuel your engines, jump over the ramp and hitch a ride on the escalator to raise or lower your engines. Build three different layouts, or go as high as you can thanks to the Stack Track risers that are sturdy and easy to connect! Included is a Stack Track Koko engine and an adaptor track piece so you can connect to other Stack Track sets and create a giant layout.