Workers attend a summary meeting after work at Za'gya Zangbo signal maintenance section in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers renovate the appearance of a signal machine in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker conducts daily maintenance on a signal machine in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker checks gaps on a switch machine in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker tidies up the jumper wires in a track circuit box in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers have dinner at Za'gya Zangbo signal maintenance section in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 24, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers head to their work sites in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker checks the internal wiring of a track circuit box in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker tidies up the jumper wires in a track circuit box in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers review monitoring data at Za'gya Zangbo signal maintenance section in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 24, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers count their tools after completing their work in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers head to Za'gya Zangbo Station to inspect signal equipment during strong winds in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 24, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers dance Guozhuang, a traditional Tibetan square dance, while waiting for maintenance window operations in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker checks the internal wiring of a track circuit box in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

Workers tidy up the jumper wires in a track circuit box in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 23, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)

A worker takes oxygen at the dormitory after returning to the Za'gya Zangbo signal maintenance section in Amdo County, Nagqu, southwest China's Xizang Autonomous Region, Jan. 24, 2026. Perched at an altitude of 4,886 meters, the Za'gya Zangbo signal maintenance section in Amdo County is the world's highest railway signal maintenance section. Fierce winds and bitter cold prevail in the area, where temperatures often drop below minus 30 degrees Celsius.

Since its establishment in 2018, the section has been responsible for maintaining and repairing signal equipment at three high-altitude stations -- Tanggula South, Za'gya Zangbo and Xuechama. Ten young workers from various ethnic groups, including the Han, Tibetan and Mongolian, are currently on duty here. With an average age of under 32, they brave extreme conditions to keep the railway operating safely, ensuring the smooth flow of trains during the upcoming Spring Festival travel rush and the long term. (Xinhua/Tenzing Nima Qadhup)