for Polymer Composites. Guidance springs are used in many technical applications. They are particularly important in train engineering for guiding the axle. In this field, the main challenge consists in obtaining a low vertical stiffness while simultaneously maintaining a definite lateral stiffness. The required prerequisite is a material which can maintain a high fatigue strength at high strains. Glass fiber composites (GRP) meets this criteria especially well. Therefore it is often attempted to substitute existing steel solutions with a GRP design. However, the limited space available for the guidance springs, especially for railroad vehicles, is a significant problem. Mostly there is not enough space for the standard GRP guidance springs version, which is based on a rectangular shape, to permanently withstand the arising forces. In this paper, a new design principle is presented, which will make it possible to use GRP guidance springs in high speed trains. This new design principle is characterized by the combination of an optimized geometry of the spring combined with an optimized fiber orientation. It was possible to prove the effectiveness of these measures through experimental results. A new principle for a clamped joint will also be introduced, due to the special quality of the problem fixing the guidance springs to the frame and the bearing case.