As found on service sheets 351B 352B.
Hornby X6203 Class 2800 / 3800 Coupling Rods & Valve Gear
Hornby X6200 Class 2800 3800 2-8-0 Loco Cylinder Block & Motion Bracket NEW
Hornby X6202W Class 2800 / 3800 Loco Driving Wheel Set Weathered