If you have attempted to learn the Choo choo shimmy before, you know it's one of the hardest to learn! Not only that the technique is complicated (foot work and hip work) but your quads and calves will also burn :)
Most beginners focus on the foot and hip work as they should but once you feel like you had the basic technique down, it's time to start framing it with some arm work so you have the complete dancer's form
Check out some ideas here ...
Learn how to do the Choo Choo shimmy