Building a new mass rapid transit system in an established city is always difficult as it requires lot of existing buildings and trees to be demolished. While, monorails need minimal space, is usually less expensive to build, the tracks cannot be used for any other train service and also difficult to evacuate in an emergency as it is on an elevated track. Should a city use monorail instead of the metro? Given that hundreds of cities have implemented these systems, participants can cite advantages and disadvantages of both the systems with real life examples.
