I have bought a DB (German railways) online ticket for the international intercity train from Amsterdam to Berlin. The train is operated by DB in Germany and, I think, by a Dutch branch of DB in the Netherlands.
I showed my ticket to the conductor on a tablet screen -- I have not been asked for a paper copy when travelling DB at any point in the last year when showing my ticket on a mobile device, and this time I didn't even have one because I forgot it in the printer.
I was told that this would be invalid from 1 January 2017 onwards.
Now, DB-Beförderungsbedingungen state in 6.3.3
6.3.3 [...] Ersatzweise kann in Zügen das Online-Ticket auch auf dem Display eines mobilen Endgerätes über ein pdf-Anzeigeprogramm vorgezeigt werden, wenn der Barcode in Originalgröße und die kompletten Fahrkartendaten bei aktivierter Hintergrundbeleuchtung vorgezeigt werden können. Die Bedienung des Endgerätes nimmt der Reisende vor; das Prüfpersonal kann jedoch die Aushändigung des Geräts zu Prüfzwecken in Anwesenheit des Reisenden verlangen. [...]
As a replacement, the Online Ticket may be shown on the display of a mobile device using a pdf viewer application in trains, if the bar code in original size and the complete ticket information can be provided with the back-lighting activated. The traveller operates the device, but the controlling personele may demand handing over the device for the purpose of investigating it in the presence of the traveller.
These conditions are valid from 19 December 2016 and, while other passages indicate changes valid e.g. from 1 February 2017, no such mention is made here.
The Dutch (NS) conditions of travel state the opposite very explicitly as
2.2 [...] • Het e-ticket is alleen geldig als het is afgedrukt – in kleur of in zwart/wit- op blanco A4 papier, in portretformaat (verticaal) zonder aanpassing van de printgrootte, op een laser of inktjet printer. Het kan in geen geval worden aangeboden op een andere drager (elektronisch, scherm enz.)
- The e-ticket is only valid when printed in colour or black and white, portrait orientation on blank A4 paper, without adjustments of print size, on a lazer or inkjet printer. In no case it can be offered on a different medium (electronic, screen etc.)
also without any indication of change.
So, am I permitted to show a digital version of my online ticket only, when travelling from Amsterdam to Hanover, both in the Netherlands and in Germany? Is it about to change?