Exploring a secret military underground train workshop

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Today I post the main mission of my second trip to China:
A once secret military underground train workshop.
In the late 1960s, a nationwide war preparation effort against the Soviet Union was launched. A proposal was made to construct a combat ready locomotive repair factory to safeguard against enemy bombings and ensure maximum safety. That's why it got constructed inside the heart of a mountain. Construction was completed in 1972, and officially opened a year later with the capacity of 50 locomotives. annual overhaul capacity of 50 locomotives Initially the factory opened as a confidential unit with its activities under semi-military management. There was a dedicated military unit within the factory responsible for patrolling and protecting the facility. In the 1980s the factory was declassified and began providing maintanance services for train locomotives. Over the course of 35 years, it repaired over 1500 locomotives before abruptly ceasing operations in 2008 due the restriction of locomotives on certain tracks. Since then, this underground workshop has been frozen in time.