Vertical Loop:

Start off by building an 'inverted teardrop' shape, then expand it out horizontally so that there is a one-block gap between the end and the start.

Immelmann Loop:

To start off with, build the same 'inverted teardrop' shape as for a vertical loop, but then remove the second half of it and replace it with a more horizontally shifted shape.

Corkscrew:

Start off by marking out the shape of the corkscrew from overhead, ensuring that it has a well-curved shape. Then put in a third dimension by building it up to form the corkscrew, ensuring that the highest point is in the centre.

Trial and error is vital to get the shaping accurate.

Put a 8-tick (2 repeaters) delay after a piece of detector rail on the section of track leading up to a lift hill, then a command block. In that command block put the following: "/setblock [X-Coordinate] [Y-Coordinate] [Z-Coordinate] slime"

X-Coordinate, Y-Coordinate, and Z-Coordinate are the coordinates of the block indicated in the image on the left.

Then put a 4-tick (1 repeater) delay, and another command block. In it put "/setblock [X-Coordinate] [Y-Coordinate - 1] [Z-Coordinate] piston 1".

Add in another 4-tick delay after that command block and then put down another command block, with the following in it: "/setblock [X-Coordinate] [Y-Coordinate - 2] [Z-Coordinate] redstone_block"

Next, put a 12-tick (3 repeater) delay, with a command block after it with the following command inside it: "/fill [X-Coordinate] [Y-Coordinate - 2] [Z-Coordinate] [X-Coordinate] [Y-Coordinate + 1] [Z-Coordinate] air"

Then put a 4-tick delay, with the following command after it: "/setblock [X-Coordinate] [Y-Coordinate] [Z-Coordinate] concrete"

This same mechanism can be applied to immelmann loops, and a corkscrew does not require a mechanism.

Apply the Invisible Rails Creator Pack in order to hide the rail in the inversion. We also recommend building terrain around the bottom of the lift hill in order to hide the mechanism.