Simplify the following text for a Grade 9 native English-speaking person.
Original: Nevertheless , its operating practices are the same as those of the three subway lines : the route is fully isolated from road traffic and pedestrians , the stations are fully covered , and the trains are boarded through many doors from high platforms within a fare-paid zone set off by a barrier .
Simplified: The route is fully separate from road traffic and pedestrians , the stations are fully covered , and the trains have many doors that use high platforms .