Heading 4406:  Railway or tramway sleepers （crossties）of wood;

WOOD AND AR Ⅸ TICLES OF WOOD; WOOD CHARCOAL; CORK AND ARTICLES OF CORK; MANUFACTURES OF STRAW, OF ESPARTO OR OF OTHER PLAITING MATERIALS; BASKETWARE AND WICKER-WORK

Wood and articles of wood; wood charcoal

 Railway or tramway sleepers （crossties）of wood;