线路发生危及行车安全故障时，其防护办法有哪些？
参考答案：
（1）立即使用列车无线调度电话等通信设备通知车站或运行列车，并在故障地点设置停车信号，如嘹望困难，遇降雾、暴风雨（雪）、扬沙等恶劣天气或夜间，还应点燃火炬。：设有固定信号机时，应先使其显示停车信号。
（2）当确知一端先来车时，应先向该端，再向另一端放：置响墩（如图），然后返回故障地点
（3）如不知来车方向，应在故障地点注意倾听和嘹望，发现来车，应急速奔向列车，用手信号旗（灯）或徒手显示停车信号，并将响墩放置在能赶到的地点，使列车在故障地点前停车。如陈望困难，遇降雾、暴风雨（雪）、扬沙等恶劣天气或夜间，发现来车后，奔向列车前，应在故障地点点燃第二支火炬。
（4）站内线路、道岔发生故障时，应立即通知车站值班员采取措施，防止机车、车辆通往该故障地点。
Ling Ruiming has long dreamed of traveling around the world. But when the 86-year-old man was diagnosed with terminal cancer, it 48 that his dream would never come true. 49 a micro blog his granddaughter Ling Yifan posted on Sina Weibo, China’s Twitter-like platform, Ling Ruiming was able to travel around the world within several days. “My grandpa is sick with few days 50 ,” she wrote. “All he wanted to do is to travel around the world. Could you please do him a favor of taking him around the world by taking a photo with his 51 at your place?” Within three hours, the post was forwarded (转发) tens of thousands of times. Ling Yifan has 52 more than 20,000 replies with photos of her grandfather’s portrait at places around the world, including the River Thames in England and the Berlin Wall in Germany, even a picture at the South Pole. Her grandfather was delighted and grateful to see his photo 53 different backgrounds from all over the world. Ling Yifan said, “It was not until three months ago, when my grandfather was diagnosed and moved to Peking University Third Hospital, that I realized the love between family members is the most precious and 54 part of life. What I did is just my way to fulfill the grandpa’s dream and 55 some of his regrets.”
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