The Helsinki metropolitan area public transit system "HSL" used to be like that....

RF_Savage 7 months ago | parent | context | favorite | on: The tiny chip that powers Montreal subway tickets

The Helsinki metropolitan area public transit system "HSL" used to be like that. Bus passes were first mifare and the DESfire after some upgrades, but the readers in the busses contained the transactions and worked offline.

If they got filled up the the standard practice was free fares. :)