Since the beginning of railroad constructions, wood has been the most useful material to fulfil the sleeper s main function of transfering actions from the rail to the track ballast. Aiming to replace the wood for both economic and environmental reasons, sleepers of other materials such as concrete, steel, and polymer have also been adopted. The objective of this study is to understand the mechanical properties of a plastic sleeper prototype. In order to verify and evaluate the results, the sleepers were subjected to creep, bending, and impact tests, according to specifications of reports from the Indian Railway Institute of Civil Engineering in Pune, the TRL Limit report proposed by R. W. Jordan and G. Morris, and the results obtained by Professor N. A. Dumont in his 2006 Laboratory Instrumentation of a Polymer Rail Sleeper Prototype report. All tests were conducted in sleepers delivered by the company Wisewood Ecological Solutions S.A. and the results describe that the sleepers act as beams that support very large shear loads. However, they present a much lower resistance to bending, high inhomogeneity and remarkable viscoelastic behavior. A very important property of a sleeper is the ability to absorb energy. In a loading impact, the structural response depends not only on the shock absorption, but also on the rigidity of the structure, the contact stiffness, and the mechanical properties of the materials.