In modern times, firemen tend to overfire a little, so the fans can see the smoke from the steam engine. Back in the day, though, a lot of visible smoke could lead to the fireman in question receiving a summons to the office to explain his wastefulness.Thanks for the good info. I don't have a lot of experience being around steamers, but the ones I have personally seen put out quite the smoke trail. Glad to know that not all steamers do that.