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1.- This Chapter does not cover : (a) Railway or tramway sleepers of wood or of concrete, or concrete guide-track sections for hovertrains (heading 44.06 or 68.10); (b) Railway or tramway track construction material of iron or steel of heading 73.02; or (c) Electrical signalling, safety or traffic control equipment of heading 85.30. 2.- Heading 86.07 applies, inter alia, to : (a) Axles, wheels, wheel sets (running gear), metal tyres, hoops and hubs and other parts of wheels; (b) Frames, underframes, bogies and bissel-bogies; (c) Axle boxes; brake gear; (d) Buffers for rolling-stock; hooks and other coupling gear and corridor connections; (e) Coachwork. 3.- Subject to the provisions of Note 1 above, heading 86.08 applies, inter alia, to : (a) Assembled track, turntables, platform buffers, loading gauges; (b) Semaphores, mechanical signal discs, level crossing control gear, signal and point controls, and other mechanical (including electro-mechanical) signalling, safety or traffic control equipment, whether or not fitted for electric lighting, for railways, tramways, roads, inland waterways, parking facilities, port installations or airfields.