Heading 4406: Railway or tramway sleepers (cross-ties) of wood:

From Chapter 44: Chapter 44

HTS Codes (10-Digit)

HTS Code Description General Duty
4406110000
Not impregnated Coniferous
 Free
4406120000
Not impregnated Nonconiferous
 Free
4406910000
Other Coniferous
 Free
4406920000
Other Nonconiferous
 Free