For most of its length it is a deep-level tube line.
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Below this is a deep-level tube station for the Bakerloo and Jubilee lines.
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It is the only deep-level tube stock to use selective door opening, for example at,, and.
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The Tower Subway was the first railway under the Thames, which was followed by all the deep-level tube lines.
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A section of the District Railway's scheme for a deep-level tube line between and was also added in order to complete the route.
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Many of the central London underground stations on deep-level tube lines are higher than the running lines to assist deceleration when arriving and acceleration when departing.
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A new generation of deep-level tube trains is planned for the mid-2020s, starting with the Piccadilly line and followed by the Central line.
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The railway arrived here in 1863 and the first deep-level tube line, now part of the Northern line's City Branch, in 1890.
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Deep-level tube trains have a floor height around less than " S " stock trains, which have low floors to ease accessibility for disabled people.
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This article details the history of the first deep level tube railway and major electric railway-an important stage in the development of the London Underground and rail transport generally.
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