The platform has a supportive substructure (10), and two parallel foundation beams (16,18,17) on the structure. The beams are at a distance to each other, and parallel to the rails, or extend in the direction of travel. Platform elements (19-23) are prefabricated in a factory, and are placed on the beams. The platform elements are U-shaped, and the legs (25,26) rest on the foundation beams. The beams have longitudinal grooves to retain the legs or rails formed on the legs. Each element consists of a poured hardened material, pref. concrete.
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