[Answer] Where is the world’s oldest underground railway, known as "the Tube"?

Step 1 : Introduction to the question "Where is the world’s oldest underground railway, known as "the Tube"?"

...The city of London changed forever on January 10, 1863. On this day, more than 50,000 people attended the grand opening of the London Underground, a dazzling new train system to help patrons travel the city at a record pace. Originally called the Metropolitan Railway, it was built between modern-day Paddington and Farringdon streets. Today, the Tube features 270 stations and 11 lines.

Step 2 : Answer to the question "Where is the world’s oldest underground railway, known as "the Tube"?"

London, England:

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