Which city first implemented a fully contactless open payment system for public transit that allowed passengers to tap credit cards directly on fare gates without needing a separate transit card?

The transportation industry has seen significant innovations in payment systems over the years, transforming how passengers pay for rides and how operators manage revenue collection. From paper tickets to contactless payments and mobile apps, these advancements have improved operational efficiency and enhanced the customer experience. This trivia question challenges your knowledge about a groundbreaking payment system implementation in public transportation that changed urban mobility.

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London (Transport for London)
Tokyo (Japan Railways)
New York City (MTA)
Hong Kong (MTR)