Purclassic 1111, correction,
You were right about the student inventing it but it was in the 1930s.
The US railways adopted a similar system in the 1960s.
RFID techniques have now replaced it.
With computers and data transmission a central computer can keep track
of where each car is located, its contents and its destination.

I think that case is so hyped without a reason. Stop it please...

Should someone be punished for NOT doing what ISN'T legal ? Sorry for all the negatives, try this: should someone be allowed to do what is legal ? Or compelled to do what isn't legal ?

Gay marriage is not yet legal. How can it be illegal, or punishable, for any baker NOT to make a cake recognising gay marriage when the law doesn't ?

So maybe we should postpone this discussion until gay marriage is actually legal, sometime in the distant future. Meanwhile, I'm much more concerned about the plight of fairy penguins, or land degradation or water pollution. Sorry, but that's just the environmentalist in me. Does anybody remember the environment ?

Joe