A train ticket is a ticket issued by a railway operator that enables the bearer to travel on the operator's network or a partner's network. Tickets can authorize the bearer to travel a set itinerary at a specific time (common for long-distance railroads), a set itinerary at any time (common for commuter railroads), a set itinerary at multiple times, or an arbitrary itinerary at specific times. The last two categories are often called passes: the former is often sold as a discounted block of trips for commuters; the latter is often sold to vacationers, such as European Eurail passes.