Eight types of electric multiple unit rolling stock operate on the MTR network and five generations of light rail vehicles operate on the light rail network. All utilise either rail gauge (near standard gauge) or (standard gauge). Except for Airport Express trains, all trains are designed to cope with high patronage, for example, through seating arrangements, additional ventilation fans, and additional sets of extra-wide doors. These configurations allow the MTR to run at 101,000 passengers per hour per direction (p/h/d) on its busy suburban East Rail line and 85,000 p/h/d on its urban metro network.