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<p>a central conductor rail is used. The conductor rail is supported on <a href="page.php?w=ceramic">ceramic</a> <a href="page.php?w=insulator_%28electricity%29">insulators</a> (known as "pots"), at top contact or insulated <a href="page.php?w=bracket_%28architecture%29">brackets</a>, at bottom contact, typically at intervals of around .</p>

<p>The trains have metal contact blocks called collector shoes (also known as <a href="page.php?w=contact_shoe">contact shoe</a>s or pickup shoes) which make contact with the conductor rail. The traction current</p><p>
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