What does maintenance window mean?

[AthenaDella]

Maintenance window refers to a reserved time period during train operation when no train routes are scheduled, allocated for maintenance and construction purposes. Below are relevant explanations: 1. Comprehensive maintenance window: To ensure operational safety, high-speed railway schedules typically establish a 5~6 hour comprehensive maintenance window at night for integrated maintenance of tracks, communication signals, and power supply equipment. 2. Maintenance window unit: In electrified railway sections, the power supply outage unit serves as the maintenance window unit. One maintenance window unit contains several basic maintenance window units. A basic maintenance window unit includes the main track in one direction within the originating station, the arrival/departure tracks on that direction's side, and the section main line between two stations.