While most of Milan's historic and modern tram network operates on a high-fidelity schedule from approximately 4:30 AM to 2:30 AM, the system is not entirely 24 hours. However, a significant exception exists with the 90 and 91 circular trolleybus lines, which run along the external ring road and provide 24-hour service to the city. For the standard tram lines, once the service ends in the early hours of the morning, the city's robust Night Bus (NM) network takes over, with many routes specifically designed to replicate the paths of the most popular tram and subway lines. In 2026, travelers can rely on the ATM Milano official app for real-time tracking, but it is a "high-fidelity" rule of thumb to expect the traditional yellow "1928" trams to retire for the night by 2:30 AM, leaving the specialized night buses to handle the city's late-night commuters and revelers.