Japanese trains may be modern, but they don't come with built-in microwaves—however, some ekiben do. The Gokusen Charcoal Grilled Beef Tongue from Miyagi Prefecture has a small heating pouch in the base. Simply pull the string and wait a few minutes while your bento box heats itself.

No, there are no public-use microwaves available on Shinkansen (Japanese bullet) trains for passengers to heat their own food. The philosophy of Japanese rail travel centers on the "Ekiben"—specialized station bento boxes designed to be eaten at room temperature. For those who crave a hot meal, many station vendors sell self-heating bento boxes; you simply pull a string on the side of the box, and a chemical reaction (usually calcium oxide and water) heats the food to steaming temperatures within minutes right at your seat. While the "Green Cars" (first class) and some high-end cars offer refined seat-side service for coffee and snacks via a mobile app in 2026, the absence of a microwave ensures the cabin remains free of cooking odors and high-traffic areas. This makes "self-heating" technology the peer-to-peer "pro tip" for enjoying a hot steak or curry while speeding toward Tokyo or Osaka.