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<p>* Line speed enforcement<br/>
* Temporary speed restriction enforcement<br/>
* Rail worker wayside safety<br/>
* Blind spot monitoring</p>

<p><big> History </big></p>
<p><big>Background</big></p>
<p>In the late 1980s, interest in train protection solutions heightened after a period of stagnant investment and decline following <a href="page.php?w=World_War_II">World War II</a>. Starting in 1990, the United States <a href="page.php?w=National_Transportation_Safety_Board">National Transportation Safety Board</a> (<abbr>NTSB</abbr>) counted <abbr>PTC</abbr> (then</p><p>
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