Working on roundtrip flight from Seattle to Seville (probably) in May. Is it easy to schedule/reserve a train ticket from Seville to Cordoba which is the start of the RS tour? Logistics of it? Thanks
You might check with the RS tour office, they generally give you the best options for getting to the start of their tours.
Trains run frequently between Seville and Cordoba. That's the line that goes on to Madrid and then (via Zaragoza) to Barcelona.
You'll want to take one of the fast trains. Those fares vary by time of day and type of train, but it's a short enough trip that a last-minute purchase will not be excrutiatingly expensive. While we'd normally recommend that you wait until you're exiting the airport to buy a train ticket for travel on your arrival day, there's a bit of an issue with doing that in Spain. It's not unheard of for Spanish express trains to sell out. You might want to check train availability frequently in the days leading up to your departure to be sure you won't have a problem.
Trains between Seville and Cordoba are operated by Renfe, Iryo and Ouigo. Renfe has the most departures, I believe.