RAILWAY OR TRAMWAY TRACK CONSTRUCTION MATERIAL OF IRON OR STEEL, THE FOLLOWING: RAILS, CHECK-RAILS AND RACK RAILS, SWITCH BLADES, CROSSING FROGS, POINT RODS AND OTHER CROSSING PIECES, SLEEPERS (CROSS-TIES), FISH- PLATES, CHAIRS, CHAIR WEDGES, SOLE PLATES (BASE PLATES), RAIL CLIPS, BEDPLATES, TIES AND OTHER MATERIAL SPECIALIZED FOR JOINTING OR FIXING RAILS