In 2026, the New York City Transit (MTA) subway system operates 28 distinct services (often called "lines" by locals) that run through 472 stations across Manhattan, Brooklyn, Queens, and the Bronx. These services are identified by letters (A, B, C, etc.) or numbers (1, 2, 3, etc.) and are grouped into several "primary trunks" based on the color of the route they follow through midtown Manhattan. For example, the Eighth Avenue Line (A, C, E) is blue, while the Broadway Line (N, Q, R, W) is yellow. While the number of "services" is 28, the physical infrastructure consists of numerous historical lines like the IND, BMT, and IRT that have been integrated over a century. The system is famous for being one of the few in the world to offer 24/7 service on almost all routes. Recent expansions, such as the ongoing Second Avenue Subway (Q) project and the modernization of signaling (CBTC), have improved frequency, but the core network of numbered and lettered trains remains the largest and most complex rapid transit system in the Western Hemisphere, carrying over 3 million passengers every single day.