The <a href="https://en.wikipedia.org/wiki/Superliner_(railcar)" id="mw0w" rel="mw:WikiLink" title="Superliner (railcar)">Superliner</a> railcar enters revenue service with <a href="https://en.wikipedia.org/wiki/Amtrak" id="mw1A" rel="mw:WikiLink" title="Amtrak">Amtrak</a>.