Yes, Madrid-Barajas Airport (MAD) is excellently connected by rail, specifically via the Metro and the Cercanías (commuter train). Metro Line 8 runs directly from the city center (Nuevos Ministerios) to two dedicated stations: one serving Terminals T1, T2, and T3, and another for Terminal T4. Additionally, the Cercanías C1 and C10 lines provide a direct link from major hubs like Atocha and Chamartín specifically to Terminal T4. If your flight departs from T1, T2, or T3 and you arrive via the Cercanías at T4, you can use the free 24-hour airport shuttle bus to transfer between buildings. For 2026 travelers, a "Multi" public transport card is required for the Metro, and a special "Airport Supplement" of €3 is automatically added to single tickets unless you hold a valid Tourist Travel Pass or monthly subscription.