What does the diamond mean on the subway?

If you're still wondering why they have this circle/diamond system on some lines instead of a simple full-time express train like the A, the simple physical reason is that these lines have three tracks, meaning they can only have express service in one direction (which of course they use to go toward the city in the AM ...



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The 7 and 7 Express, which use the Flushing Line through Midtown Manhattan, are colored purple.

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Maneuver Manhattan's train system like a local Here, Archer Hotel New York's consummate host offers timely tips on navigating the New York City subway (aka train) system like a boss. LOCAL TIP: New Yorkers typically call the subway “trains” (not underground or metro) or by their alpha name (the C or the Q).

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The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.

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In terms of strict dictionary definitions, both terms imply underground trains. Subway is a generic term, but metro is more localized to certain cities. Subway is generally used for underground train systems and metro for above ground.

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The J Nassau Street Local and Z Nassau Street Express are two rapid transit services in the B Division of the New York City Subway. Their route emblems, or bullets, are colored brown since they use the BMT Nassau Street Line in Lower Manhattan.

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NYC Transit assistant chief of the Division of Stations Branko Kleva told Slate that the mysterious black gunk is actually a material called mastic, which the city has used to seal and waterproof the tunnel structures.

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