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Open information management

Information about how your details are used to gain insight into passenger travel patterns.

What do we use your personal information for?

NS and the other public transport companies want to ensure that public transport operates as effectively and efficiently as possible. That is why these companies are interested in gaining an insight into travellers' journey patterns. This insight is also important to third parties such as government authorities that are responsible for public and other forms of transport, and external organisations that develop activities relevant to public transport interests or that are committed to improving services to travellers.

We obtain this insight through statistical research. NS and the other public transport companies (collectively referred to as 'we' or 'us') have jointly decided which personal data may be used to gain this insight and the ways in which the data may be used. We also refer to this as Information Management. These agreements are set out in a Cooperation Agreement between the public transport companies.

In accordance with the privacy legislation, we may also use transaction data for statistical research on the grounds listed in our Privacy Statement.

What personal data do we use?

We have decided that statistical research into the travel patterns of passengers may only be based on so-called transaction details, rather than customer details, such as your name or date of birth.

Transaction details are generated when you use your OV-chipkaart to check in and out and can be processed thanks to the chip-ID in your card. These details are used to handle your travel transactions, which falls under the remit of Trans Link Systems B.V. (hereinafter "Translink"). You can view your transaction details in your OV-chipkaart transaction overview.

We save the transaction details used for statistical research in a separate Translink database. Before the data are saved, they are pseudonymised first, which involves encrypting personally identifiable information included in the data. This means that the data cannot be traced to individuals without using additional information. After the data have been pseudonymised, they are added to research files managed by Translink, turning them into a set of statistical data. These aggregated statistical research files let Translink or other specialised parties create information products. The research files and information products do not contain personal information.

Central point of contact

We have set up a central point of contact to answer all your questions about how data are processed to compile research files and information products. You can get in touch with Translink by sending an e-mail to You can also submit a request with Translink to exercise your rights.

If you do not want us to use your transaction details for statistical research into travel patterns, you can indicate this by sending an e-mail. To do so, please send an e-mail to Translink, via Specify your card number in your e-mail and indicate clearly that you object to the use of the transaction details that are linked to the card in question for statistical purposes.

With whom do we share this data?

Your data are processed by Translink on our behalf. We have made arrangements about this matter with Translink and recorded them in a processing agreement, including arrangements about security and separate data storage.

Translink uses a third party to pseudonymise the transaction details, which makes it more difficult to trace the details used back to an individual person. Translink then uses the data to compile aggregated statistical research files that cannot be retraced to individuals.

These research files let Translink or other specialist parties create information products, which lets them indicate passenger flow trends that can be used where new public transport links are required. We can pass these information products on to government agencies and third parties that are responsible for or carry out activities relating to public and other transport and improving public transport services for travellers. The information products do not contain personal data and are only made available:

  1. To carriers and government authorities, based on the performance of the contract with the traveller;
  2. To science, on the basis of a legitimate interest;
  3. To knowledge institutions, on the basis of a legitimate interest;
  4. Publicly, on the basis of a legitimate interest.

We do not pass on your personal information to (legal) entities outside the European Economic Area.

How long do we store your information?

We store the transaction details and pseudonymised transaction details for up to 18 months after the trip in question.