It's true! They're called subways when they're belowground and elevated trains — “els — when they're up in the air.
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There are several reasons why more trains do not operate underground: 1. Cost: Building and maintaining underground train systems can be extremely expensive. Excavating tunnels, constructing stations, and installing ventilation and electrical systems require significant financial resources.
THE world's deepest metro system is the Pyongyang Metro in North Korea which is 110 meters deep. The tunnel was built as part of an underground military facility. THE world's deepest metro, underground station is the Arsenalna Station on the Kiev Metro in Ukraine, at 107 meters deep.
In 1863, the world's first underground railway was built, connecting Paddington station – the London rail terminus for many prosperous commuters to the City – to Farringdon Street, just minutes from the Bank of England.
Eighty percent of the 286 kilometers (177 mile) Maglev bullet train track will be located underground, passing under urban sprawl and mountainous terrain.
Building underground railways so close to the surface proved to be a very expensive exercise and it was realised that considerable costs would be saved if new tubes could be built at a deeper level, where they would involve much less disruption to existing buildings and services.
The era of the freight train-hopping, job-seeking hobo faded into obscurity in the years following the Second World War. Many hobos from this era have since “caught the westbound,” or died. A small number of so-called hobos still hop freight trains today.