Long time, no see. I did not touch any of my attraction ranking spreadsheets for almost all of 2017, and now I revisited them and made some new updates.
With the carousels, I removed all of the ones with only molded metal figures; and with the steam railroads, I removed everything with a track gauge less than 15 inches (minimum gauge). The most significant update, however, was with the roller coasters. First, I removed the rule that any operator running more than one roller coaster gets included, regardless of the size of the roller coasters. Under this rule, many operators running nothing but crummy, rusting carnival roller coasters got included (Wacky Worm city, basically). Second, I lowered the thresholds for height, length, and speed that a roller coaster needs to be included. Those new thresholds are 64.35 ft. tall or more, 1,930.44 ft. long or more, and 43.87 mph or more. These new thresholds revolve around the acceleration of gravity, which makes them feel a lot more logical than the old ones. Specifically, the height and speed stats revolve around how fast an object in free fall travels after exactly two seconds, while the length stat references how far an object will travel on an incline starting from 64.35 ft., if the time it takes to reach the ground is 60 seconds. When you look at the height and speed stats in metric form, they are about 19.6 meters and 19.6 meters/second, respectively. This seems to a natural dividing line between junior and kiddie roller coasters, and bigger, more noteworthy roller coasters. With the combined mass removal due to the first change and the mass addition due to the second change, and general updates from not having updated it for a year, there was a net loss of around 500 roller coasters on the spreadsheet. Again, almost all of the ones removed were garbage from places that most people have never heard of, so they won't be missed. Also, here are the new averages: 62.29 ft.; 1,738.85 ft.; 34.95 mph.
As far as the one roller coaster that comes the closest to the new thresholds, where all three of its stats are greater than or equal to the thresholds, that award goes to White Lightning at Fun Spot America Orlando (69.67 ft.; 2,032.00 ft.; 44.30 mph). I have thus determined that this roller coaster is the "perfect" roller coaster, in that it's size is almost exactly in the middle overall compared to all other roller coasters, and hence appeals to the widest audience possible (not too big to scare away squeamish people, but not too small for thrillseekers to dismiss, and so forth). Plus, it's in Orlando, yet it's not in one of the big parks, so you don't have to pay for parking, travel a mile from the parking lot to the gate, or have to deal with giant crowds to get to it. Here's its POV video: https://www.youtube.com/watch?v=8eAFfv-aLzg
So, without further ado, here is the latest Top 50 on the Roller Coaster Rankings Spreadsheet: