He's got a whale of a tail to tell about the time he took the underground overground and wound up grounded to an undersea creature.

就好比他得了条鲸鱼尾，他何时游走于水上水下，缠住其它海洋生物。

It's short for Docklands Light Railway. Actually, it it an overground system connecting East London to the London Underground network.

它是港区轻轨简称。实际上，它是一个连接东伦敦和伦敦铁网上系统。

Most major cities already have some form of  city-wide transit network, whether it's a subway or an effective overground rail system.

大多数主要城市已经拥有某种形式全市交通网，无论是铁还是有效上铁路系统。