How fast is a HO train traveling at 65mph going at human scale?
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65 MPH/87.086 (HO scale factor, according to Wikipedia) = .746 MPH.
.746 MPH X (88 feet/second)/(60 MPH) = 1.09 feet/second.
This seems slow, but if you put a webcam or video camera trackside to get the correct perspective, it looks better.
You can apply a flat spot to one of your wheels so you can hear the bump. If your model supplier has sold you wheels of the correct diameter, you can use the bump rate, as compared to prototypes, to get a good scale speed estimate. And, it sounds a bit realistic.
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When you get a chance to fly, try to catch a glimpse of railroad operations. You’ll probably notice (like I did) that from a bird’s eye view, prototype trains seem to just creep along. Much of their beauty comes from the smooth, steady, and patient pace. They are really quite graceful.