I only counted 18 via RCDB
Dollywood-9 (Lightning Rod, Thunderhead, Dragonflier, Whistle Punk Chaser, Mystery Mine, Blazing Fury, Firechaser Express, Wild Eagle, Tennessee Tornado), with a recently removed kiddie cred so there are probably people with 10 credits
Kiddie coasters-2 (Spinning Parrot, Speedway coaster)
and 7 mountain coasters, but I would only plan to get Rail Runner (and the Jurassic Boats, but I would skip if the money isn't there) this trip.