A railroad sleeper (1) for fastening of at least one pair of rails (2,2′) of a railroad network, the railroad sleeper (1) comprising a contact surface (3), wherein each rail of the pair of rails (2, 2′) is fixed spaced apart from each other, the railroad sleeper (1) comprising a hollow sector (4) delimited by association of the contact surface (3) with parallel anchorage walls (5,5′), thus establishing a free portion (17) adjacent to the anchorage walls (5.5′) and opposite the contact surface (3), wherein the contact surface (3) and the anchorage walls (5, 5′) establish an inner wall (13), an outer wall (14) and an intermediate layer (15) of the railroad sleeper (1), so that:
- the inner (13) and outer (14) walls of the railroad sleeper (1) are manufactured from a first polymeric material, and
- the intermediate layer (15) is manufactured from a polymeric composition comprising a bending module higher than or equal to 5000 Mpa,
- and wherein at least fixation blocks (10) or metallic plates (22, 22′) are arranged at portions of the hollow sector (4) opposite the point of arrangement of the rails on the contact surface (3).