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subway-surface noun

  /ˌsʌb.weɪ̯ ˈsɝːfɨs/ , [ˌsab.wej ˈsɜ.fɐs] , [ˌsəb.wej ˈsɚ.fɪs] , [ˌsʌb.wej ˈsɝː.fɨs] , [ˌsʌb.we̞j ˈsəː.fəs]
  • (rail, US) streetcar lines whose sections in the city center operate in tunnels like subway lines; typically built to speed up streetcar service by bypassing congested streets, as provision for future conversion to rapid transit, or both.
 Stadtbahn
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