Their utilization is also accomplished over-ground and underground just like the metropolitanrailway itself.
蚂蚁在地上和地下完成他们的使命，如同大城市里的铁路一样。
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The first line was the partially underground MetropolitanRailway line which opened in 1863, and is now a part of the more expansive London underground system.
Sixteen years later, in 1884, the MetropolitanRailway Company and the Metropolitan District Railway linked up and provided the underground service in the middle of the city.