Yes, eating and drinking on the Shinkansen (Japanese bullet train) is not only "OK" but is a highly encouraged and celebrated part of the travel culture. Most major stations sell "Ekiben" (station bento boxes) specifically designed for the journey, often featuring local delicacies from that region. Trains are equipped with spacious tray tables and seat-back pockets to accommodate your meal. In 2026, it is polite to avoid foods with extremely strong odors (like heavy garlic or pungent seafood) and to ensure you dispose of all your trash in the bins located at the end of each car. While eating is normal on long-distance trains like the Shinkansen or Limited Express, you should strictly avoid eating on local commuter trains or metros, where it is considered rude and disruptive to other passengers.