In terms of design, the Expert steam locomotive leaves hardly any room for wishes and takes into account all the structural and visual features of the prototype locomotive, such as PKP lamps, enlarged coal box, the true-to-original cable routing on the boiler or fine die-cast metal spoke wheels in typical PKP colours. The factory-integrated PIKO PSD XP sound decoder enables the switching of lighting in the drivers cab and running gear area. In addition, a digitally switched, flickering LED in the area of the firebox simulates the red glowing coals. All of the lighting, including the light change in the direction of travel, is designed using modern, maintenance-free LED technology. The numerous typical vehicle sounds ensure true-to-original model railway operation