London Underground: What Each 'code' Over The Loudspeaker ...

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• Code 1 Means Blood…and 6 Other Secret Codes London ... - The Sun

• 7 Secret Codes Of The London Underground And What They Really Mean

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• London Underground Secret Codes And What They Mean - The Mirror

• [PDF] Three Letter Abbreviations – Station Codes

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• Tube Experts Of R/london, What Does "Code 8" Refer To? - Reddit

• Inspector Sands And Why The London Underground Keeps Asking For ...

• London Underground: Secret Codes Tube Staff Use And What They Mean