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Double-decker buses in New York are strictly used for tourist rides these days. But that wasn’t always the case: The city once teemed with them, like London does.

New Yorkers can find a vestige of that bygone era at the New York Transit Museum’s annual Bus Fest at Brooklyn Bridge Park this Sunday. The event is basically the Woodstock of buses. And the headlining act is “Betsy,” a century-old double-decker bus that once trundled along Manhattan’s streets. When the bus lovers see good ol’ Betsy, they go nuts.

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