Snowmobiles

* Re “U.S. to Curb Snowmobiles in Parks,” April 27: Hooray for the National Park Service! My wife and I took a winter tour in Yellowstone Park three years ago. We saw numerous caravans of 40, 50 and 60 snowmobiles going in both directions, as shown in the photograph with your story. The noise was deafening, and after they all passed, the air was blue with exhaust smoke.

Surviving a winter in Yellowstone is tough enough for a bison without having to keep dodging endless snowmobile traffic.

JOSEPH E. STASCH

Newport Beach