Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Chen Zhonghao)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Chen Zhonghao)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Ju Huanzong)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Chen Zhonghao)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Chen Zhonghao)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Ju Huanzong)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Zhang Chenlin)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Zhang Chenlin)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Chen Zhonghao)

Tourists view a train running amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Ju Huanzong)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Zhang Chenlin)

Tourists view a train running amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Ju Huanzong)

Train S2 runs amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Ju Huanzong)

Tourists view a train running amid blooming flowers near the Juyongguan section of the Great Wall in Beijing, capital of China, March 29, 2024. (Xinhua/Zhang Chenlin)