They're attached to the main rails with a fastening system and are used to help stabilise the track and ensure the train can travel smoothly at speeds of up to 200 kilometres an hour for passenger services.

它们通过紧固系统连接到主轨上，用于帮助稳定轨道，并确保列车能够以每小时 200 公里的速度平稳行驶，为乘客服务。