Oysters Shucked, Part Two

For the second time in a fortnight, a major fault has crippled the Oyster system. A "technical problem" is currently afflicting Pay As You Go cards on the Tube, say TfL, who have wisely decided to leave all Underground station barriers open until the problem is solved. Coming barely two weeks after a fault left tens of thousands of cards corrupted, and mere days after it was confirmed Dutch researchers would be allowed to publish their Oyster hack, the system, which turns five this month, seems to be having a few growing pains.