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现在铁道线路采用的轨枕有木枕、混凝土轨枕、钢枕等。此外,还有一种新式轨枕——塑料轨枕。确切地说,这是一种由合成聚合物制作的轨枕。塑料轨枕在欧洲已经使用了十五年,在奥地利维也纳市郊铁路,首先铺用了用钢筋和聚氨基甲酸酯聚合物为基本原料的轨枕。此后,在意大利的米兰、瑞士的苏黎世、德国的汉诺威也相继使用塑料轨枕。尽管如此,塑料轨枕还只是一种特殊产品,只能满足特殊线路结构的需要。在现有条件
Railroad sleepers are now used in wooden sleepers, concrete sleepers, steel pillows and so on. In addition, there is a new type of sleeper - plastic sleeper. To be precise, this is a sleeper made of synthetic polymer. Plastic sleepers have been in use in Europe for 15 years. On the suburban railway in Vienna, Austria, sleepers made of steel and polyurethane polymer are first used. Since then, plastic sleepers have been used in Milan, Italy, Zurich, Switzerland and Hanover, Germany. In spite of this, plastic sleepers are just a special product that can only meet the needs of a special line structure. In the existing conditions