Is it really that hard?

With 2017 technology, you’d think it wouldn’t be that difficult to produce a safe automated system for trains running in a controlled environment. Good grief, I think I could cobble together a bunch of IoT sensors and do the job for <$1000/car easy. https://wtop.com/tracking-metro-24-7/2017/12/metro-acknowledges-smoother-rides-better-dont-expect-soon/