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Half of the London Underground is above ground primarily due to historical and geographical factors. When the system was developed in the late 19th and early 20th centuries, many routes were built on existing railway lines that were already elevated or at ground level. Additionally, constructing underground tunnels in certain areas was more challenging and expensive due to existing infrastructure and the city's geology. This design allows for a mix of efficient transit and preservation of urban landscapes.

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1d ago

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