Section 17 Vehicles, aircraft, vessels and associated transport equipment 86 Railway or tramway locomotives, rolling-stock and parts thereof; railway or tramway track fixtures and fittings and parts thereof; mechanical (incl. electro-mechanical) traffic signalling equipment of all kinds 86 07 Parts of railway or tramway locomotives or rolling-stock 86 07 21 Air brakes and parts thereof 86 07 21 00 Air brakes and parts thereof Commodity Code Description 86 07 21 00 000 Air brakes and parts thereof