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and buses cleaned multiple times per day. All high-contact areas at subway stations (handrails, fare gates, and fare vending machines) are cleaned every 4 hours. Vehicle Air flow Every 60 seconds, our buses , trains, and trolleys recycle and refresh filtered air, and completely exchange air at least 10 times every hour Take the T. Questions or Comments?. The Orange Line has seen the most dramatic changes over the past 20 years than any other of Boston's transit lines. Once known as the Main Line El, the Orange Line consisted of an elevated line from Everett, through Charlestown, and entered a shared portal with the Green Line at North Station. It then exited the subway in Chinatown, and.