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Line 4 (yellow L4) Barcelona Metro. Updated 2023.
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Línea 4 del metro de Madrid (L4). Actualizado en 2023.
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Paris Métro Line 4 - Wikipedia
Ligne 4 (@Ligne4_RATP) / Twitter
Budapest Metro 4 - Green line
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Athens Municipality Joins Next Phase for City's Metro Line 4 | GTP Headlines
Operating metro - Metropolitan Sofia
