| 1/00 | Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway (draining by trenches, culverts, or conduits E01F 5/00) |
| 2/00 | General structure of permanent way (railway networks B61B 1/00; foundations for pavings E01C 3/00; foundations in general E02D) |
| 3/00 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails |
| 3/02 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) |
| 3/04 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Means for preventing cleaving |
| 3/06 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Means for preventing cleaving Anti-cracking dogs |
| 3/08 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Means for preventing cleaving Straps or bands for hooping or encircling sleepers (apparatus for hooping wooden railway sleepers on the spot E01B 31/28) |
| 3/10 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Composite sleepers |
| 3/12 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Longitudinal sleepers; Longitudinal sleepers integral or combined with tie-rods; Combined longitudinal and transverse sleepers |
| 3/14 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from wood (drying or impregnating B27K) Slabs; Blocks; Fastening tie-rods to them |
| 3/16 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel |
| 3/18 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel Composite sleepers |
| 3/20 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel Sleeper construction for special purposes, e.g. with openings for ballast working (sleepers for shiftable track for heavy loads E01B 23/12) |
| 3/22 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel Longitudinal sleepers; Longitudinal sleepers integral or combined with tie-rods; Combined longitudinal and transverse sleepers |
| 3/24 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel Slabs; Blocks; Pot sleepers; Fastening tie-rods to them |
| 3/26 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from steel combined with inserts of wood, artificial stone, or other material |
| 3/28 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone (manufacture B28) |
| 3/30 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone (manufacture B28) Hollow sleepers |
| 3/32 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone (manufacture B28) with armouring or reinforcement (hollow sleepers E01B 3/3) |
| 3/34 | Transverse or longitudinal sleepers (for switches or crossings E01B 7/22); Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone (manufacture B28) with armouring or reinforcement (hollow sleepers E01B 3/3) with pre-tensioned armouring or reinforcement (pre-tensioned armouring or reinforcing elements E04C 5/00) |