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During the early stages of determining what type of rail system to build in Dallas, monorail was on the table.  As I remember the argument, there were a number of objections to it.  At the end of the debate Dallas Area Rapid Transit (DART) opted for light rail.At the time there was only one manufacturer in the world that could supply the equipment for an extensive monorail system.  It is a bad idea to lock onto one supplier; he has you by the throat when it comes to maintenance and the acquisition of additional equipment.Switching from one route to another, as has been mention, is a big challenge for monorails.  The overhead apparatus to support the monorail is ugly.  Admittedly, this is a personal preference.  I spent a lot of time in Sydney, Australia whilst living in Australia.  The Sydney monorail is an eyesore.  If a monorail train breaks down between stations, the passengers have to be evacuated by ladder.  As a rule the fire department has to be called or the transit agency has to have the equivalent of a hook and ladder truck.  Getting older or infirmed passengers off the train is a daunting task.The stations are expensive to build.  They all require escalators as well as stairs and perhaps elevators.  Light rail stations and heavy rail stations only require escalators if they are located under ground or on an elevated line.  As an example, DART has only two stations with escalators.  All the other stations are at ground level. One of the advantages of the light rail system in Dallas is that it permits an across the platform transfer to the Trinity Railway Express trains.  If Dallas had opted for a monorail, the transfer would have been much more difficult.
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