Yes, there is a very efficient direct train service from Madrid-Barajas Airport (MAD) to the city center via the "Cercanías" commuter rail system (Line C-1 and Line C-10). The train station is located in the basement of Terminal 4 (T4). If you arrive at Terminals 1, 2, or 3, you will need to take the free airport shuttle bus to T4 to access the train. The Cercanías train takes approximately 20 to 25 minutes to reach major central hubs like Chamartín, Recoletos, and Atocha (the main high-speed rail station). This is often the preferred method for travelers because it is significantly cheaper than a taxi and more direct than the Metro. While the Metro (Line 8) also serves the airport, it requires a transfer at Nuevos Ministerios to reach the very heart of the city (like Sol or Gran Vía), and it carries an additional "airport supplement" fee. The Cercanías train is particularly convenient for those with a valid Renfe "Combinado Cercanías" code, which is often included for free with long-distance high-speed AVE train tickets, allowing you a seamless and free connection from the airport to your final rail destination.