I have been checking the June 20, 2016 SNCF schedule for the Paris to Rouen train and there are only two trains - 6:11 a.m., arriving at 7:50, and 6:53 p.m., arriving at 8:25. In the 2016 Rick Steves France book, he mentions the trains depart nearly hourly. Out of curiosity, I checked the schedule for July 1, and there are additional trains, but not the "nearly hourly" schedule mentioned in the book.
I suspect that the current schedule will change to reflect Summer travel. Does anyone know if/when the SNCF schedule does change, or is the comment in the France guide inaccurate? We are planning on picking up a rental car in Rouen to begin touring Normandy, the Loire Valley and the Dordogne in June. We may have to modify our plans if the schedule doesn't change.