Roller coaster launches can be pretty complex. There are various ways you can launch a roller coaster train. These types of coasters tend to be more prone to break downs and that is a whole discussion right there.
There are always new types of roller coasters in development and rumors are about where the first installation of each new coaster type may take place. Typically there is around a handful of new coasters built around the country every year. I follow YouTube channels of people who consistently give visual updates of construction progress.
I'd recommend
Theme Park Stop Expedition Theme Park Theme Park History
For some YouTube channels. There are way more channels out there and various websites with discussion forums and stuff like that.
Man you've found me a whole new thing to sink time into
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But to you who are listening I say: Love your enemies, do good to those who hate you, bless those who curse you, pray for those who mistreat you.