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Inquire about the difficulty of maintaining metro rail systems

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Inquire about the difficulty of maintaining metro rail systems
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London Underground Limited was formed in 1985, but its history dates back to 1863 when the first world underground railway opened in London.. . Today London Underground is a major business, with over 3 million passenger journeys a day, some 500 peak trains, 253 stations owned (275 served), over 12,000 staff and vast engineering assets.. . below are the links for more info...
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really difficult
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it is very tough, and important. without proper preventative maintenance, and regular inspections, they would break down, and have accidents, or derailments all of the time. . . it is costly, but extremely important for the safety of passengers and employees.
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Its very simple, need lot of experts to maintain the wear and tear that's all..
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