Section 15 Base metals and articles of base metal 73 Articles of iron or steel. 73 02 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 Commodity Code Description 73 02 10 Rails 73 02 30 Switch blades, cross frogs, point rods and other crossing pieces 73 02 40 Fish-plates and sole plates 73 02 90 Other