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Train Nystagmus
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I believe that it also refers to the tendency of a loco, or car, to hunt from side to side on the tracks. Yard switchers, with no leading truck, tended to be bad for this at any higher speed. You can even see it on models. Watch a 0-4-0 going down the track. It will look like it is wobbling. It's almost bouncing back and forth between the rails. <br />It's caused by the tendency of the wheels, due to the tires being machined at an angle, to always try to center the wheels on the track. Four wheel locos, and trucks, can be very bad about doing this. <br /> <br />CShaveRR, <br />That drowsy feeling is vertigo. Airplane pilots are taught, when you fly single engine prop planes, when on final approach, especially into the sun, never let the engine idle for any period of time. Always blip the throttle occasionally to break up the pulse. It can cause vertigo, and eventually lead to unconsiousness. <br />My instructor told the story , when I was taking flying lessons, of a pilot that landed just fine, and rolled to a stop at the end of the runway. The tower couldn't raise him on the radio. A truck was sent out to the plane, and they found him unconsionus over the wheel. <br />Any steady pulse, especially if it is a light pulse, can cause it.
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