here aresome stuff i use for my rollercoasters...

UPDATE:
-motion speed control
-ride minecarts without rails
-start with sculk sensor... react on mount and dismount
-double looping



- 4way track switch
- up and down water elevator (in same stream of water)
- multifloor elevator
- water elevator
- honey elevator
- jumps
- start/stop
- player detector start
- drop
- slow up hill
- start 4 minecarts at the same
- fakelooping
- teleport
- flymaschine
....
...
...

have fun