Metro train approaching Meadow Well Station
"Metro increasingly adopted the black 'M' as its logo, and it soon came to adorn the front and sides of the Metrocars. The Calvert typeface, and in particular the black 'M' on yellow background, became as locally distinctive markers of the Metro as the London Underground roundel is for Londoners. Outside Metro stations, you’ll now find totems with a yellow box at the top, each vertical side displaying a Calvert 'M'
Andrew Curtis
CC BY-SA 2.0
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