请问意铁订票后，坐火车还需要换票吗？

我定了 罗马到威尼斯的夜火车 IC， 选择ticketless ，然后发过来一个带条形码的receipt。


上面有时间什么的信息，但是最下角有一个，

ATTENTION: this payment receipt is not valid as a travel ticket as it relates to a ticketless purchase.

To register your presence on board, please notify the ticket code (PNR) to the train personnel.

是否说，我还需要去火车站换一个票呢？单凭这个邮件发过来的receipt，到底能做火车马？

谢谢！