SF = Single Flight, as far as I'm concerned. On weekdays, it's a 50-50 chance that most coasters will be riding one train, only a select few run to capacity. Examples: SFDL's S: ROS, WoA's- Villain, X-Flight, SFKK- Chang, Twisted Sisters, T2.....the list goes on and why I keep coming back to crappy SF capacity, I don't know. X-Flight is a different experience....it's not a bad ride, but it's good on it's own merit.
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There's nothing like a woodie...