Which city opened the world's first subway line in 1863?

• A. Boston
• B. Chicago
• C. New York
• D. London

Answer: (D)

London is the city that opened the world's first subway line in 1863. This revolutionary development was part of the Metropolitan Railway, which aimed to alleviate the congestion caused by horse-drawn carriages in the bustling streets of London. The idea of an underground railway was innovative at the time and marked a significant advancement in urban transportation. The success of this first subway line laid the foundation for the extensive underground transit systems that many cities around the world would later develop.

The construction and operation of the Metropolitan Railway demonstrated engineering capabilities of the era and helped set the stage for urban planning and public transportation advancements, influencing cities worldwide as they grew and modernized during the Industrial Revolution.