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| Greek | English |
| υπόγειος σιδηρόδρομος | underground railway An electric passenger railway operated in underground tunnels |
| υπόγειος σιδηρόδρομος | underground train A train for transportation of people, mostly beneath the surface of the ground, in order to lessen the traffic |
| υπόγειος σιδηρόδρομος | underground train |
| υπόγειος συλλεκτήριος αγωγός εξόδου | underground outlet channel |