Possible, but we’d have to see the reader. The ones I know for transport systems are not the swipe type, but the put card in a slot type, so it needs to stay the same size or get lost in the innards of the machine (don’t ask me how I know… I was young).
I think the practical limit would be 4, for each of the orientations the card can go into the reader.
Not if you cut the card in half
Possible, but we’d have to see the reader. The ones I know for transport systems are not the swipe type, but the put card in a slot type, so it needs to stay the same size or get lost in the innards of the machine (don’t ask me how I know… I was young).