And while some are busy commuter lines, others are off-the-beaten-track gems that are well-worth connecting to.
BBC: Majestic Canada, coast to coast
In North America the assembly lines are busy, but cheap imports push down prices.
ECONOMIST: Mercedes goes to Motown
If the lines are busy, an answerphone message tells children to keep redialling.
BBC: NI Childline 'in need of funds'
And Jiang sees more of the same: He has been busy adding four new production lines to his two factories, which employ 800 workers.
CNN: China's Rarest Man
The station, on both the busy Sokolnicheskaya and Tagansko-Krasnopresnenskaya lines, lies beneath the headquarters of the Federal Security Service (FSB).
BBC: Moscow Metro hit by deadly suicide bombings
Several of the explosions targeted railway lines linking Soweto to Johannesburg, leaving busy commuter routes in chaos.
BBC: Mosque in Soweto
Engineers (late game worker units) are always busy continuously building roads so that new armies can reach the front lines.
FORBES: Reddit User Has Been Playing The Same Game Of Civilization II For Over Ten Years
The magnetic field lines are like the two lanes of traffic on a busy road: close together, but pointing in opposite directions.
ECONOMIST: Hot stuff
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