What does maintenance window mean?
2 Answers
Maintenance window refers to a short period during which train operations are suspended to allow certain units to conduct maintenance on equipment such as tracks and overhead contact systems. This period is called a maintenance window or maintenance window point. Definition of maintenance window: It refers to the time reserved in the train operation diagram for construction and maintenance work, during which no train operation lines are scheduled or train operations are adjusted or reduced. Maintenance window time regulations: For high-speed railways, the maintenance window (for construction and maintenance) should in principle be no less than 240 minutes. For conventional-speed railways, the construction maintenance window should be no less than 180 minutes for technical renovation projects, major and medium repairs of tracks and bridges, large-scale track maintenance machinery operations, and major repairs and renovations of overhead contact systems. For conventional-speed railways, the maintenance window should be no less than 120 minutes for double-track lines and no less than 90 minutes for single-track lines.
I've driven quite a few cars, and what's referred to as the 'sunroof point' usually means the operation position or key point of a car's sunroof, such as the switch button or the detent on the sliding rail. As a car owner, I've noticed this point is crucial every time I operate the sunroof. If it gets stuck or malfunctions, the sunroof won't open or close properly, and it can also affect ventilation. I remember once after rain, there was a leak, and upon inspection, I found that the seal at the sunroof point had aged and cracked. I quickly replaced the seal to fix the issue. A sunroof isn't just for enjoying the view; it can also provide emergency ventilation. However, this point requires regular maintenance, like cleaning the sliding rail and applying lubricant every six months to prevent dust and rust. If the point doesn't respond, never force it to avoid damage—seeking professional repair is worry-free and effortless.
