If you want to make a roller coaster like Defribulattor, build a steel track that has a giant chained hill behind the station, then make a very long track in front of it (remember to make a big enough length.
Otherwise it will crash), then, when you go to the test and go screen, go to the gears, then click where it says Continuous Circuit Mode.
Click on the one that says Reverse Shuttle Incline Mode. Then test, and if it doesn't fall of, open it. (To do one like Shuttle Loop, take away the big hill step, and go to the CCM.
Click on the powered launch, then Jack up the speed.)
We have more cheats and tips for this game here, Rollercoaster Tycoon cheats
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