Die cast metal chassis and cylinders with working vacuum pump - Die cast wheels with steel tyres - Brake shoes in ABS plastic - Two styles of sand boxes in ABS - 5 pole skew wound precision motor - Helical gearbox - Sprung driving wheel and pony trucks - Front and rear pony wheel trucks to operate on a cam system to allow the model to traverse R2 (40.5 radius) curves - Die cast pivoted coupling and connecting rods, plated then blackened - The footplate valance to include the packing piece for the extended version. Two versions of smokebox door one with fixings for B. Number plate - Easily removable cab roof (for adding a crew) by means of small magnets - Chimney, short and tall safety valve casings and whistles to be turned metal parts - Working cab doors in ABS - Wire handrails with stanchions in metal - Sprung metal buffers and screw link couplings - Full back head detail with reversing lever in ABS - Coal load in bunker - Flickering firebox glow.