This was also the case with NTAG. If you watch early test run footage of NTAG (the tests where they ran two cars), the ride sounds very much like IRat does, with that signature roaring sound. This could've been caused by the hardness of the polyurethane wheels causing the hollow track beams to vibrate, making that sound. If you look at pictures of the debuting of the NTAG trains and the IRat trains, they both have wheels with a thin white layer of polyurethane, which they used for testing on the rides. But right before NTAG opened, they switched to a softer polyurethane type of wheel, making the ride a whole lot quieter. You can tell by looking at pictures of NTAG before and after it opened; before it opened, the polyurethane layer on the wheels was white and thinner, and then after it opened the polyurethane layer was black and thicker. Maybe they'll do this for IRat before it opens to dampen the roaring sound. But in the end, I really don't care how loud it is. I just want to ride it!!!
