This is not an original mod, but a port of an existing one. The original ExRollerCoaster was made for Minecraft 1.7.10 by this person; they plan to eventually move to a more modern Minecraft version but this port is here in the meantime.
I ported it to Minecraft 1.12.2 so it could be enjoyed in a more modern Minecraft game. I will not be porting it beyond 1.12.2.
The aim of the port is/was to faithfully port the existing ExRollerCoaster 1.7.10 content, while adding new content that might be enjoyable.
Due to Forge having moved on from 1.12.2, and frankly getting bored with it, maintaining this mod is very low priority for me, but pull requests are welcome.