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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 10-35 MPH. Notification to train crews is referred to as a "slow order."
In the United Kingdom the term "speed restriction" is used, either permanent (PSR), temporary (TSR) or emergency (ESR).
TSR and ESR
TSRs and ESRs are used where movement of the track is causing problems.
As will 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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