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), thus establishing a free portion (17) adjacent to anchorage walls (5.5′) and opposite the contact surface (3), wherein the
- railroad sleeper is manufactured from a polymeric composition comprising a bending module higher than or equal to 5000 MPa,
- and wherein at least fixation blocks (10) are arranged at portions of the hollow sector (4) opposite the point of arrangement of the rails on the contact surface (3).