Midwest - Questions on St.Louis 1-day bus pass

Is there a place near Amtrak's union station downtown to get the 1-day pass? Does it work 24 hours from first use like Chicago's 1-day pass? Does it work on the light rail also?

Amtrak now stops across the street from the old Union Station. (If you're coming to/from Chicago, Megabus stops on the other side of Union Station from the new train station.) There's a Metrolink LRT station outside the Amtrak station, and its farecard dispensing machines sell day passes. Not sure about the 24-hour rule -- there's no overnight service anyhow.

I wouldn't call Amtrak stopping "across the street" from Union Station.. it's actually about 3-4 blocks away.

The One Day pass is good for a calendar day, not 24 hours.

Greg