The Museo del Ferrocarril, located near the Retiro subway station, is a paradise for train enthusiasts. It offers free admission on Wednesdays, allowing visitors to explore its collection of historic locomotives, carriages, and railway artifacts. The museum showcases the development of railways in Spain and the role they played in shaping the country's transportation system. Visitors can learn about the history of trains, experience a simulated train ride, and admire the engineering marvels of the past.