Railway track material, Part 21: Turnouts, switches and crossings
铁路轨道材料第21部分:道岔、道岔和道口
发布日期:
2020-06-23
本标准旨在提供道岔、道岔和道口及其部件的设计和制造信息和要求。
The objective of this Standard is to provide information and requirements for the design and manufacture of turnouts, switches and crossings, and their components.