railroad_tunnel
1. [ noun ] (transportation) a tunnel through which the railroad track runs
Related terms: tunnel chunnel
Similar spelling:   railroad_tie
  railroad_vine
  railroad_line
  railroad_train
  railroad_ticket
  railroad_man
  railroad_flat
  railroad_track
  railroad_terminal
  railroad_car
  railroad_bed
  railroad_station
  railroad_worm
  railroad_engineer
  railroad_siding