As an American, I am traveling to France with a vaccination record that shows 2 shots and one booster. Last booster was 11 months ago September 21st, 2021. I have also had and recovered from COVID just seven months ago.
I believe I am fine to fly into the country, but I want to take Eurail speed train from Lyon to Paris while I am there. Will I need to show any proof of updated vaccination (perhaps within 6 months) to be able to take Eurail as long as I am traveling in-country?