Sound bites

"I think the fares are still incredibly cheap when compared with cities like London, Madrid and New York. I know they have risen quite a lot in relative terms here, but it is still very good value for tourists like us."

Andrew May, a 27-year-old on a tour of Beijing from Leicester, England

"The increased ticket prices must be coupled with better services. The ticket gates at subway stations fail to function sometimes and there are not enough ticket booths inside stations."