A weakness of systems that rely on wheel rotation for tachometry and odometry is that the train wheels and the rails are very smooth and the friction between them is low, leading to high error rates if the wheels slip or slide. Part of a series of articles on cars. This is one reason why there is often a time delay between the train stopping, as perceived by a passenger, and the doors being released. In analogue audio recording , a tachometer is a device that measures the speed of audiotape as it passes across the head. On most audio tape recorders the tachometer or simply "tach" is a relatively large spindle near the ERP head stack , isolated from the feed and take-up spindles by tension idlers. This can assist the driver in selecting appropriate throttle and gear settings for the driving conditions. It is difficult to prove conclusively that the vehicle is stationary, other than by waiting a certain time to ensure that no further pulses occur. Components Propeller governor Propeller speed reduction unit Spinner.
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