Explanatory notes
… (i) They must be identifiable as being suitable for use solely or principally with the above‑mentioned vehicles; … (wheel centres, metal tyres, etc.). (4) Axle‑boxes, also known as lubricating or grease‑boxes, and parts thereof … gear (e.g., hook, screw or chain type, draft gears); some coupling devices may be automatic. (8) Frames and …