Meaning any indication of the future (especially favorable) is from 1650s; earlier (1630s) in extended sense of benevolent influence of greater power, influence exerted on behalf of someone or something, originally in expression under the auspices of.
The King of Prussia Mall is located in the community of King of Prussia in Upper Merion Township, Montgomery County, Pennsylvania, 20 miles (32 km) northwest of Philadelphia.
In looking at the Maps link at the top of the page, I do not see King Of Prussia listed as a rail stop. But then again, I don't know the geography of PA very well so I could be missing it. At the top of the page (next to the Maps link), there is a Plan My Trip link.