Yes, you can absolutely use a Eurail Pass on almost all Deutsche Bahn (DB) trains in Germany. The Eurail Pass is highly effective in Germany because the national carrier, DB, does not require mandatory seat reservations on most of its high-speed ICE (Intercity Express) or IC trains. You can simply hop on any train and find an unreserved seat. The only exceptions in 2026 are certain international high-speed routes during the peak summer season (June to August), such as trains to Paris or Amsterdam, which may require a paid reservation. Additionally, your pass covers the S-Bahn (suburban trains) in major cities like Berlin and Munich, but it does not cover "U-Bahn" (subway), trams, or local buses. If you have a Global Pass, Germany is one of the easiest countries to navigate due to this flexibility and the lack of complex supplement fees.