The prize looks is a voucher for 2 tickets anywhere Amtrak travels. As they say in the official rules, "Two (2) round-trip Amtrak tickets to anywhere in the U.S. serviced by Amtrak (ARV: $1,596.00 each). AMTRAK tickets will be awarded in the form of a voucher. Prizes must be used within 12 months of prize award or prize will be forfeited. All meals, transfers, taxes, upgrades and other expenses are not included, and are the sole responsibility of the winners. Substitutions and upgrades are not permitted." So, it looks like you can't upgrade to a sleeper using these tickets.
So here's my question: if you won, do you think you could choose to travel to from Lorton, Virginia, to Sanford, Florida? It does say "anywhere in the US serviced by Amtrak", but it also says "other restrictions may apply". I have a feeling they'd invoke that restriction.