Open the website of the City of Richmond. At the toolbar on the top of the page, brush the mouse over "Visitors," and then click on "Main Street Station."
Open the "Parking" link on the left side of the page. A page with a map and the listed rates for parking around the Main Street Station will appear. Print the page---making sure that the map comes out clearly---in order to keep it with you on the date of your visit.
Exit I-95 at Exit 74B on the date of your visit. Use the map and local signs to navigate to parking lots that serve the Amtrak station.