I never buy or sell internationally. The reason is that it takes too
long for the item to arrive and the other country might have laws that I
don't know about. In your case France must have some law against
shipping toy trains.
For whatever reason the seller has blocked you from bidding on his
items. I suggest that you email the seller and ask him the reason and
also ask him to unblock you.
Go to your eBay page and click "help and contact." Keep trying different
options until you are able to click "Contact by phone." After you click
that option eBay will call you in about 5 minutes at the number you have
on file with eBay.