b_179_129_16777215_00_images_UK171717aa006.jpegLONDON — Commuters on the crowded London Underground are accustomed to the "mind the gap" warnings from overhead speakers as trains pull into station platforms, but they recently got a glimpse of another change that infuriated many.

The world's oldest subway system unveiled a trial last month to help tourists deal with the congested system: green-painted markings at King's Cross station, a major stop, to show where the doors open.

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