Unfortunately despite significant capital investment to run double track on the FEC corridor from West Palm to Miami (their initial route before expanding north), they and the FEC have been unable/unwilling to do much about the fundamental flaw of rail in densely populated South Florida: at-grade crossings, many in no-horn zones because nearby residents have lobbied for that. This has been a problem for decades even when the line was freight-only.
All too predictably, a recent investigation [1] found Brightline is the deadliest passenger railroad in the US. Good data visualization and sobering reporting in that article. The railroad wants to socialize the costs of upgrading the crossings but of course privatize the profits. That said, I feel communities that want the density/development benefits of "transit" should be prepared for the costs of achieving that safely.
[1]: https://www.miamiherald.com/news/local/article308679915.html
