[NoZebra120vClip]

I had a friend who carried around a canceled credit card to get free rides on the bus. The fare boxes accepted swipes and didn't/couldn't settle transactions until they were back in the barn. So they took any credit card that checksummed, I suppose.

They ceased this feature soon afterwards. I was appalled that they'd ever enabled it if it was so vulnerable. (I don't think public transit really cares about collecting fares as a priority.)

[felixg3]

In 2013, I did that to get a free luggage trolley at Chicago O’hare. Just swiped an old credit card for the dollar and it immediately unlocked.