This invention uses the time-proven structure known as a "suspension bridge" which has been around for hundreds of years, more than half of the bridges of the world are suspension bridges, simply because they're simplicity, low-cost and ease to build!.
Let's see how it works: A suspension bridge consists of a main cable anchored at each end as well as vertical suspender cables that carry the weight of the deck below, the cable is suspended between two towers. Any load applied to the bridge is transformed into tension in this main cable. Now the main innovation is to move the two anchors to the sides of the towers, and keeping the cable on both sides with a beam, and then interconnecting the neighboring segments to that same tower, placing the anchors on both sides, the adjoining segments are very important because without them, the weight of the deck will bend the towers inwards, collapsing them..
Once the segments are interconnected, the structure is duplicated, and the cables of each segment are intercrossed, this intercrossing supports the track and creates a strong structure and adds a lot of stability from lateral fluctuations like wind, as well as normal movement within the cars due to curves on the track and passanger movement.
This system can solve most public transportation problems because it minimally impacts the streets below, requires a minimum of materials and is quick to build which makes it very cost-effective.