Much of Cape Town's existing railway network has no fencing next to it, people wandering across the lines, theft of infrastructure, and robbery of passengers where criminals jump on and off the trains between stations.
Seeing Cape Town is not suited to an underground railway (which could have solved some of the problems) going overhead seems to be the next logical conclusion as it requires no fencing, puts infrastructure more out of reach, and eliminates the ease for criminals to jump on and off the train between stations. It also helps ensure passengers embark and disembark at controlled points where tickets must be purchased.
MyCiti busses seem to be a success story but have difficulty in many areas where the roads could not be widened. Going overhead allows the service to follow rivers, existing railways or even already congested roads.
Watch a video about Wuppertal's system at Schwebebahn: Why Wuppertal's Trains Are Much Cooler Than Yours
Wuppertal has possibly the world's most badass public transport: a 120-year-old swingin' suspension railway. But the question is: why? When everyone else was...