轨枕的种类有木枕、钢筋混凝土枕、钢枕,另外还有一种塑料轨枕,或者说是一种合成橡胶或聚合物轨枕。塑料轨枕在欧洲现已成功地使用了十多年。奥地利首先为它的国内城市运输系统生产了强化的聚氨基甲酸乙酯轨枕,从那时以来,这种塑料轨枕已经使用在意大利的米兰、瑞士的苏黎世和联邦德国的汉诺威等运输线路上。不过,必须将塑料轨枕看作是一种非常特殊的产 Types of sleepers are wooden pillows, reinforced concrete pillows, steel pillows, as well as plastic sleepers, or synthetic rubber or polymer sleepers. Plastic sleepers have been successfully used in Europe for more than a decade. Austria first produced a reinforced polyurethane sleeper for its domestic urban transport system, which has since been used on transport routes in Milan, Italy, Zurich, Switzerland and Hanover, the Federal Republic of Germany. However, plastic sleepers must be considered as a very special product