There was a coaster at King's Dominion in Virginia called Rebel Yell (since renamed Racer 75) that ran backwards on one of the 2 tracks from 1992 to 2008. I remember it being fun but I preferred the forward facing ride.
Kennywood used to have a ride where you were launched forward through a loop and then up an incline till gravity counteracted momentum. You'd then fall backwards down the incline, back through the loop, through the station, and backwards up an incline, then roll down and forward back into the station.
https://en.wikipedia.org/wiki/Racer_75
https://www.youtube.com/watch?v=adES4jZpAHk