That, I think, is the real issue. When you're in Durango, you may be passed by SUVs--some of them named Durango for a reason, you may hear a cell phone go off, and you may even talk about a funny e-mail. But stray into the yard and shops, stand in front of a big, black, steaming monster, smell the smoke, the oil, the steam...and you're back in the 1920s. The railroad is an historic landmark. It is open to the public, which means it's a chance for one and all, big and little, to transcend time and see and feel and hear and smell what it was like back then, if only for a brief moment or two. We may not live in a vacuum, YoHo, but you're too eager to give up what is arguably the least of the offenders. I agree with what JCater said. A few coal-burning locos every 10,000 square miles are an insignificant drop in the bucket compared to industrial pollution. If you want to help save the planet, start with China and Mexico. The pollution from these countries is legendary, but such press doesn't generate the self-loathing that American "environmentalists" seek to create. But I digress. :zip: The point is that people are inclined to look at a big, black engine belching out coal smoke and think, "My god, what an environmental disaster!" We associate pollution with smoke, but the actual content of the smoke needs scientific analysis to determine how harmful it actually is. I've never needed to wear a breathing mask in Durango, but I see enough of them in pictures from Beijing and Mexico City. Being able to touch and smell history is one of the remaining reasons we go to visit historic sites. Take away these senses, and you take away our reason for going. You might as well buy a video and save the airfare.