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Miami's Metrorail sorely lacks a few things.
It lacks any east-west service to Miami. A lot of people work and live near Flagler street, which goes straight into Miami, and a lot of the people living near it commute on it by bus into Miami. It really could support a line, hence the blue line. It'd also give a connection between FIU and Miami. FIU is Florida's public university in Miami-Dade county, but as you can see, it's pretty far from Miami itself. A private university, UM, is close to a pre-existing station though.
Unrelatedly, both tourists and locals would benefit from some sort of rail to Miami Beach. Thus, the blue line continues there. Government Center, the de facto central station for Metrorail, already has an east-west-aligned platform, never used. With some maintenance, the blue line could use it. The stop at Government Center would have to be longer than other stops though to accommodate all the people not passing through.
There's a lack of a line for people who quickly want to go north or south. If you're in south of Miami, like in Kendall and want to reach north of Miami, like Hialeah, or vice versa, you have to take the entire half-circle that is the green line. It takes a long time. The pink line could do the same trip in a smaller distance and with fewer stops. This would also help connect more people to Tri-Rail.
Despite it barely being visible on this map, the red line on the south edge is very important. There used to be rails there, but they got paved over for BRT. This red line would undo that, since the people south of Miami don't deserve that. It'd extend, as the current BRT does, to Homestead and Florida City. There's a significant number of people south of Miami who commute towards Miami.
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