I beg to differ, Alex. Red McMillion, who was an engineer on the Cass Scenic Railroad and for Meadow River Lumber Co., could run a Heisler or a Shay all day long without ever getting a spot on his clothing. Prior to his run, he would put on a boiler suit and go over the engine, oiling and greasing and wiping as needed, but when it was show time, he peeled off the boiler suit and stayed clean for the rest of the day. My wife's late grandfather, Harry Kiner, spent his entire career (42 years) in the cab of Pennsylvania Railroad steam locomotives and diesels, and pictures show him wearing coveralls with a shirt and necktie, goggles and long gauntlet gloves with not a bit of dirt to be seen. And that was saying something, since the PRR was noted for using the crappiest, dirtiest, cheapest bituminous coal it could buy.