| 21. | The "'1962 Tube Stock "'was a type of London Underground tube train built for use on the Central line.
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| 22. | The 1972 Stock was ordered to make up the shortfall in trains on the Northern line's 1959 Tube Stock fleet.
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| 23. | In the early 1960s, the extension of electrification of the Metropolitan line to saw the introduction of four-car 1972 tube stock.
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| 24. | The "'1949 Tube Stock "'was composed of ninety-one cars built by the Birmingham Railway Carriage and Wagon Company in Smethwick, England.
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| 25. | The "'Watford Joint Tube Stock "'was built for the service to Watford along both the Underground and the London North Western Railway.
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| 26. | With the introduction of the 1995 Tube Stock in 1999 . The 1972 Mark 2 stock was extensively refurbished in the 1990s.
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| 27. | Originally it was planned to refurbish some 30 1938 trains, but this was scrapped in favour of 30 new trains-1972 Mk1 Tube stock.
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| 28. | These led to the 1996 tube stock; refurbishment of the 1983 stock was being considered, but building new trains cost about the same.
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| 29. | Upon entering service in April 1993, the new units gradually replaced the previous 1962 tube stock, which was finally withdrawn two years later.
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| 30. | The design managed to be both stylish in an appropriately Warholesque way and self-evidently simple to manufacture from the raw sheet and tube stock.
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