The choo choo arc is from ATS.

From: community.livejournal.com/omdancecenter
Start off in a basic Choo-choo with the right arm extended horizontal and the left arm lifted overhead. Continue the hip bumps in place, angled so that your right hip is toward the front of your box.

Cue: Drop the left arm across the front of the body until it reaches the right arm. Both hands press down to signal the actual turn.

As the hands press down, press your weight down on the ball of the right foot to pivot to the back and swiftly swing your right foot around so you can push yourself back around to the front.

Arms: Drop the left arm across the front of the body until it reaches the right arm. Keep your shoulders pressed back. Then drop both arms as you pivot in place, bringing the hands down and across the hips from right to left. Lead with your wrists. As you get back to the original position, lift the arms back and overhead, letting the right arm float down to its original position.

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I know I've seen the rubber band turn, but I haven't done them and I don't know how to describe. I'm sure someone will post something about it soon...