Monorails

transit,personal rapid transit,public transit,mass transit,PRT,transportation,urban transit,alternative transit,monorail ,new urbanism,APM,elevated,infrastructure 
A single beam serving as a track for passenger or freight vehicles. In most cases rail is elevated, but monorails can also run at grade, below grade or in subway tunnels. Vehicles are either suspended from or straddle a guideway. Monorail carry 50 to 80 passengers up to 80 mph  deway driverless transport elevated