You guys back East may not be familier with tumbleweeds, but anybody living West of the Missippi is probably aware of them. Usually if you hit one with a car they just go "poof" and explode into little bits of dead weed. I just received an email from a buddy about a BNSF coal drag that was pulling Rowley hill 12 miles West of Hardin, Montana at a speed of 15mph into a 50 mph headwind. They hit a drift of thousands of tumbleweeds, and the things got under the wheels of the locomotive and they couldn't get traction. The train came to a dead stop in about 5 car lengths! They got 2 helper engines sent out to push on the rear of the train, but couldn't get it moving! They were stuck there for 5 hours 35 minutes and then had to back down the hill to change crews because they had run out of time! The story was related by one of the members of the crew on the train trying to get through them. I tried to copy past the enclosure with pics, but I can't figure out how to do it.