Upvote:0
The paper form to file a G30 claim :
virement en euros
This means that only a SEPA (Single Euro Payments Area) transfer is available, you can follow the Wise recommendation of @gerrit.
Upvote:1
You could open a multi-currency account. I have one with Wise which gives me routing details in several countries/currencies, including EUR and USD. You would get IBAN and BIC for a euro account that you pass on to SNCF, getting your refund into your euro account. You then exchange it to USD from where you should be able to transfer it to your own US account (or, if that fails, get a debit card with the Wise account and use that to spend it directly).