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Message: [QUOTE="WoodsRider, post: 150683, member: 16545"] [b]Did someone say choo-choos?[/b] A spark arrestor is required on any locomotive that operates within the United States boundaries per American Association of Railroads (AAR) specification. Even switcher units that never leave the yard must have a s/a. If I dig out the AAR spec., I can tell you how far back this goes. I don't know of any documented case where spark from an exhaust created a fire, but it is very possible even on a modern internal combustion engine. I've seen fire balls shoot out of locomotive turbochargers due to internal engine (fuel delivery) problems. If you want to ride in a National Forest here, you'd better have a USFS approved spark arrestor installed. We've all seen the destruction caused by forest fires this year. I don't think one or two pounds and [B]maybe[/B] one horsepower loss is worth causing all that death and destruction. [/QUOTE]