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| tube; underground railway; underground (U-Bahn); subway (U-Bahn) | |||
| underground railroad | |||
| subway; tube (London); underground (railway) | |||
| underground | |||
| underground train; underground railway An electric passenger railway operated in underground tunnels; underground train A train for transportation of people, mostly beneath the surface of the ground, in order to lessen the traffic | |||
| metro | |||
| tube railway; metropolitan railway | |||
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| underground railways | |||
| Untergrundbahn: 9 phrases in 4 subjects |
| Construction | 3 |
| General | 1 |
| Informal | 1 |
| Transport | 4 |