You're taking a photo of something that's moving, and you want to convey a sense of speed, even if the subject isn't moving quickly.
The quickest and best way to do this is to slow down your shutter speed, which will cause the moving subject to blur in its line of motion and create the illusion that it is moving quickly even if it's moving relatively slowly.
In this picture taken near the Northern Pacific Railway Museum in Toppenish, Wash., I got a freight train going past the old depot that houses the museum. At this point, the train is passing through town and just went over a rail crossing, so it's only going about 25 mph. Not terribly fast.
But I set my ISO to 100 and stopped down to f-29, which gave me a shutter speed of 1/5 of a second. That caused the train to blur significantly as it went down the rails, while the depot and lamp post remain clear, helping further sell the concept.
(In case you're wondering, I actually hand-held this photo as it was a relatively spur-of-the-moment shot. Since I don't drink coffee, my hands are fairly steady. But a tripod would not hurt, especially if you want to use even slower shutter speeds.)
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