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According to the current environmental legislation, wooden railroad ties are after the end of their service life considered as a hazardous waste. Various impregnating agents, representing mixtures of distillation fractions (creosote oils) and having a proven carcinogenic character, are used at their production. These agents serve as a wood protection against weather conditions and an attack of biological agents. After the elimination of hazardous impregnating substances, high percentage of quality wood pulp can fi...