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I noticed they needed eye protection in the lab.

I'd love to see how they avoid needing eye protection for people near the train tracks in the field (presumably some shielding and very careful laser alignment?).

I'd be particularly interested in whether the lasers are safe on overhead tracks near populated areas (certain MTA lines in New York are like this).

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I imagine the laser undergoes significant decoherence in practice.

No one is doing quantum leaf removal. I think you mean dispersion.

Elevated tracks probably don’t have much of a problem with leaves falling on them due to their height. The NYCT does presently use “gel” trains on on-ground tracks, but I’ve no idea if they use them on elevated tracks.

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