Metallic ballons are not allowed

No balloons in metro system. This time a star shaped one!

This is another version of the Hong Kong one (I’m still missing a sad kid with the balloon)

After searching a little online, it looks like a lost metallic balloon can be a real problem for an underground system, as it happened in 1996 in Hong Kong. The lost balloon can get up and short-cut the power lines of the trains, leaving the hole system stopped for a while. It’s really well explained here.

Seen in Metro de Madrid, Spain

Thanks Mr. Leandro for the pic!


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