underground system

Frequency: 8.625.9 per million words

The entire network of underground railway lines.

undergroundunderground + NOUN

Categories:

system

Examples (10)

  • It brought the whole underground system to a halt.
  • The city's underground system is highly efficient.
  • During rush hour, the underground system can be very crowded.
  • Plans are underway to expand the underground system to new areas.
  • Maintenance work on the underground system often causes delays.
  • Many commuters rely on the underground system for their daily travel.
  • The new signaling will improve the safety of the underground system.
  • A comprehensive map of the underground system is available at every station.
  • The underground system experienced several disruptions today.
  • He was studying the intricate design of the city's underground system.