| Main Entry: | railroad |
| Part of Speech: | noun |
| Definition: | train line |
Synonyms: |
elevated railway, line, metro, monorail, rail line, railway, streetcar line, subway, tracks, trolley line, tube, underground railway |
| Main Entry: | underground railroad |
| Part of Speech: | noun |
| Definition: | secret cooperative network |
Synonyms: |
subway, underground railway, underground route |