On newer trains, and especially high-speed trains, they are more spacious than what you might find on an airplane and offer the same basic features as those of a plane lavatory - a flushable toilet, sink with running water, soap, and paper towels. On older trains, bathrooms can be significantly less accommodating.

Yes, high-speed trains across Europe—including the French TGV, German ICE, Italian Frecciarossa, and Spanish AVE—are equipped with modern, well-maintained bathroom facilities. Unlike the older "gravity-drop" toilets on regional lines, modern high-speed trains use advanced vacuum flushing systems similar to those found on commercial aircraft, which are more hygienic and water-efficient. Typically, there is at least one bathroom located at the end of every carriage, or every other carriage, depending on the specific train model. These facilities generally include a flushable toilet, a sink with running water (often motion-activated), liquid soap, and paper towels or hand dryers. Most high-speed sets also feature at least one extra-large accessible bathroom designed for passengers with limited mobility or those traveling with strollers, which often include a fold-down baby-changing table. While these bathrooms are cleaned at major hubs, it is always a good idea to carry a small pack of tissues or hand sanitizer, especially during peak travel times when supplies may run low on long trans-European journeys.