1. hand-held crossbars and seats in the cars so that passengers can stay balanced and comfortable while the subway is moving.
2. Visual and auditory cueing systems, such as electronic displays, announcements, and automated station announcements, so that passengers can easily learn about the routes the subway is taking and the stations they are arriving at.
3. cell phone signals and Wi-Fi coverage so that passengers can use devices such as cell phones and computers for work or entertainment on the subway.
4. Child-friendly seats and handrails for the disabled, so that passengers with special needs can ride the subway more conveniently and safely.
Besides the above convenient facilities, the subway can also add some other facilities, such as:
1. vending machines and convenience stores, convenient for passengers to buy daily necessities and small food.
2. charging stations and free charging outlets so that passengers can charge their devices such as cell phones and computers at any time.
3. Newspaper kiosks and reading rooms where passengers can borrow books, newspapers and magazines to spend their time on the subway.
4. Emergency facilities and first aid stations for passengers to get timely medical help in case of emergency.
These facilities not only provide better service but also help in improving the comfort and safety of the metro.