I plan to buy the unlimited OV Chip Card 2 days pass that could be used on trams buses trains. I wonder if it could be used in both cities Amsterdam and Rotterdam. Or each city has its own OV Chip card since the operators are different (RET for Rotterdam & GBV for Amsterdam)
Also I plan to take the Arriva bus to Kinderdijk. Could this be covered by the day pass disposable OV chip since the operator is not RET?