The production status of rail steel and smelting technology of heavy-rail steel in China are summarized.
本文对我国钢轨钢的生产情况及重轨钢的冶炼技术做了综合论述。
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He points out that both Hong Kong and Zurich have managed to make a success of their rail systems, heavy and light respectively, though there are few cities in the world as hilly.