This system consists of a set of prefab elements that are assembled during the installation steps. These include an L-shaped girder made of prestressed reinforced concrete, which is the load-bearing structural element, self-bearing slab tracks of variable length depending on the bridge span, which are equipped with the fastening systems to the rails, connection beams, which are used to create a network of collaborating sleepers, and the side service walkways. The slab tracks are placed in such way that their bottoms form a continuous line at the sides of the L-shaped girders which, on their turn, sit on existing or new shoulders. Once fastened, resin is filled in the gaps between the slab tracks and the girders. Vibrations are damped through the elastomers in the fastening systems, the structure of the prefab elements that work as energy accumulators, and the application of reinforced neoprene packs on the shoulder mounts. The LPTA system is suitable for spans between 12 and 18 metres. The time for replacement of LPTA bridges with two rails or a dual span is 48 hours.