A worker works at the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province, Nov. 30, 2020. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

Aerial photo taken on Nov. 30, 2020 shows the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

Aerial photo taken on Nov. 30, 2020 shows the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

Workers work at the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province, Nov. 30, 2020. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

A worker works at the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province, Nov. 30, 2020. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

Aerial photo taken on Nov. 30, 2020 shows the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)

Workers work at the construction site of the Sanhe section of the Beijing-Tangshan intercity railway in Langfang City, north China's Hebei Province, Nov. 30, 2020. The 148.74-kilometer intercity railway linking Beijing, capital of China, and Tangshan, a port city in north China's Hebei Province is under construction with a designed speed of 350 kilometers per hour. (Xinhua/Xing Guangli)