Slow zone
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A slow zone, in America, is an area where a train is forced to slow down for either structural, construction, power, signal, or track problems. Slow zones limit a train to about 15-35 MPH.
In the United Kingdom the term "speed restriction" is used, either permanent (PSR), temporary (TSR) or emergency (ESR).
The last two are used where movement of the track is causing problems. PSR's are usually only for curves or switches and crossings (S&C). PSRs may also be imposed where signal spacing is short relative to braking distances.
As wil be seen from the image, some PSRs are dual, allowing certain trains to pass at a higher speed, such as InterCity 125 (HST) and certain other classes.
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