What do you us to heat the boiler, a can of Sterno? lol.
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Tank engines evolved as a way to handle short lines and switching duties in a train yard. The engine carried a small amount of coal behind the cab and water in its tanks. A tank engine is therefore self-contained and does not need the coal/water car. This makes it lighter, smaller and less expensive, but gives it a pretty limited range before it must be re-coaled and re-watered. - from "HowStuffWorks.com".
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