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In page Frankfurt:
"Frankfurt also reemerged as Germany's transportation hub and Frankfurt Airport became Europe's second-busiest airport behind London Heathrow Airport in 1961.[citation needed] During the 1970s, the city created one of Europe's most efficient underground transportation systems.[11] That system includes a suburban rail system (S-Bahn) linking outlying communities with the city center, and a deep underground light rail system with smaller coaches (U-Bahn) also capable of travelling above ground on rails.
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