Although "rail" is in the name, an Interrail Pass is actually a versatile multi-modal travel document that covers much more than just trains. While its primary use is for unlimited travel on national railway networks across 33 European countries, the pass also includes numerous ferry routes and bus services. For instance, Interrail partners with major ferry companies like Blue Star Ferries, Grimaldi Lines, and Stena Line, allowing pass holders to receive significant discounts (often up to 30–50%) or even free passage on routes between Italy and Greece, or across the North Sea. In certain regions where the rail network is sparse, such as parts of the Balkans or the Austrian Alps, the pass is often valid on specific national bus lines that act as railway substitutes. Additionally, the pass frequently provides bonus benefits such as discounted entry to museums, reduced rates at partner hostels, and special deals on public city transport in select major hubs. This makes the Interrail Pass more of a "comprehensive European travel pass" rather than a strict train ticket, providing a flexible and cost-effective way to navigate the continent's diverse geography using the best available transit methods.