4406 Railway or Tramway Sleepers `cross-ties` of Wood

4406 (01/1988-..) Railway or Tramway Sleepers `cross-ties` of Wood 44061000 (01/1988-12/2016) Railway or Tramway Sleepers `cross-ties` of Wood, not Impregnated 44061100 (01/2017-..) Railway or Tramway Sleepers `cross-ties` of Wood, not Impregnated, Coniferous 44061200 (01/2017-..) Railway or Tramway Sleepers `cross-ties` of Wood, not Impregnated, Non-coniferous 44069000 (01/1988-12/2016) Railway or Tramway Sleepers `cross-ties` of Wood, Impregnated 44069100 (01/2017-..) Railway or Tramway Sleepers `cross-ties` of Wood, Impregnated, Coniferous 44069200 (01/2017-..) Railway or Tramway Sleepers `cross-ties` of Wood, Impregnated, Non-coniferous