Wheelchair users board trains using a variety of methods depending on the station infrastructure and the type of train. In modern "level-boarding" stations, the platform is at the exact same height as the train floor, allowing users to simply roll on and off. However, in older or multi-national stations, mobile ramps are the most common solution; station staff or train crew will deploy a metal ramp to bridge the gap and height difference between the platform and the carriage. On some long-distance trains, such as those operated by Amtrak in the US or certain regional lines in Europe, the train cars themselves may be equipped with built-in mechanical lifts. For a smooth journey, it is standard practice to book "Assistance" at least 24 hours in advance so that staff are ready with the necessary equipment when the train arrives. Most trains also feature dedicated "wheelchair spaces" and accessible restrooms in specific carriages near the boarding doors.