Sweden's state-owned rail operator SJ is allowing passengers to use microchip implants rather than conventional tickets.
The idea is currently being trialed just among some SJ members. It means all they need to travel is their left hand and the small microchip implanted in it. Authorities believe implanting the microchip will make the train journey more convenient.
SJ claims to be the first travel company in the world to enable passengers to use microchip implants to validate their tickets. The small implants use Near Field Communication technology, the same tech used in contactless credit cards or mobile payments.
Implanting microchips under the skin is becoming increasingly popular in Sweden. But experts warn there are security and privacy issues to consider.