The onboard responder antenna drops into or near the railtop which cause the train digression .
车载应答器天线坠入铁轨或其附近, 导致列车脱轨。
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China is the first and only country to have commercial high-speed train service on conventional rail lines that can reach a top operational speed of 350 km/h.
France broke the world rail-speed record when a high-speed train travelling on the new line from Paris to Strasbourg touched a top speed of nearly 575kph (357mph).