underground, subway, metro = metro

Night Tube strike: London Underground workers vote for action over ...

Source: http://www.independent.co.uk/news/uk/home-news/night-tube-strike-london-underground-maintenance-engineering-workers-when-date-stations-affected-a7044801.html

metro

English sentence and Polish translation

Just take the underground, it's faster. = Po prostu jedź metrem, jest szybsze.