Yes, you are absolutely allowed to eat and drink on the Narita Express (N'EX) in 2026. In fact, eating on "Limited Express" and Shinkansen trains is a celebrated part of Japanese travel culture. Most passengers purchase a "Bento Box" (Ekiben) or snacks at Narita Airport or Tokyo Station before boarding. The seats are designed for dining, featuring large fold-down tray tables and cup holders. However, etiquette is very important: you should avoid foods with strong or pungent odors (like heavy garlic or fast-food fries) out of respect for other passengers in the quiet cabin. Additionally, you are expected to take all your trash with you or dispose of it in the dedicated recycling bins located in the vestibules between the train cars to keep the environment pristine for the next traveler.