What does maintenance window mean?

[JasmineMarie]

Maintenance window refers to a designated period during train operations when no trains are scheduled to run, allowing time for maintenance and construction work. Below are relevant details: Comprehensive maintenance window: To ensure operational safety, high-speed railway schedules typically allocate a 5~6 hour comprehensive maintenance window during nighttime for simultaneous maintenance of tracks, communication signals, and power supply equipment. Maintenance window unit: In electrified railway sections, the power supply outage unit serves as the maintenance window unit. One maintenance window unit comprises several basic maintenance window units. A basic maintenance window unit includes the main track in one direction within the starting station, the arrival and departure tracks on that side, and the section main track between two stations.