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this is maybe my least favorite bit of transit-related pedantry, but it's officially designated the 'L' (in single quotes) by the CTA.

> this is maybe my least favorite bit of transit-related pedantry

I'm most impressed that you've stack-ranked your various bits of transit-related pedantry.

But, in the interest of science, what is your most favorite bit of transit-related pedantry?

The thing that connects a train to overhead wires is called a pantograph. The connection to a third rail is not a pantograph.