Hi, on the direct train from Amsterdam to Cologne on the Rail Europe site there is no charge, but I can’t add the booking to reserve the seats (I assume it is because there is not a seated reservation fee to be paid). If I then go to the exact same train and journey to the Eurail site, there is a supplement charge they want to charge.
Kindly assist, why is there supplement charge on Eurail site, and why can’t I add the booking on the Rail Europe site, which has no charge.
With thanks