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The invention discloses a box body of a railway vehicle traveling gearbox. The box body comprises an upper box body and a lower box body, wherein the upper and lower box bodies are fixedly connected to form the box body; an input shaft bearing pedestal and an axle bearing pedestal are arranged in the box body; the axle bearing pedestal is of a split structure, one half is located on the upper box body and the other half is located on the lower box body; the combination surface between the upper and lower box bodies is inclined; a plurality of reinforcement ribs are distributed on the surfaces of the upper and lower box bodies; the reinforcement ribs extend outwards from the periphery of the axle bearing pedestal; the input shaft bearing pedestal is integrally located on the upper box body; the end of the combination surface between the upper and lower box bodies close to the input shaft bearing pedestal is lower than the end close to the axle bearing pedestal; the included angle between the combination surface and the horizontal direction is ranged in 25-35 degrees; a torsion bar connection boss is arranged at the lower part of the end of the upper box body close to the input shaft bearing pedestal; and a safety support is arranged at the upper part of the end of the upper box body close to the input shaft bearing pedestal. The box body of the railway vehicle traveling gearbox is simple and reasonable in structure, safe, reliable and capable of satisfying the high-speed traveling requirement.