1) This Chapter does not cover ;
a) Railway or tramway sleepers of wood or of concrete, or concrete guide-track sections for hovertrains (heading 4406 or 6810)
b) Railway or tramway track construction material of iron or steel of heading 7302 ; or
c) Electrical signalling, safety or traffic control equipment of heading 8530.
2) Heading 8607 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;
a) Coachwork.

3) Subject to the provisions of Note 1 above, heading 8608 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.