Yes, not only is it ok, but they actually sell beer on the trains. Originally Answered: Is it ok to drink alcohol on the Shinkansen? Don't they sell beer and sake on the Bento trolley that goes down the aisles? Yes, its OK to drink on the train.
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Having a few drinks is perfectly acceptable; the emphasis on Shinkansen trains is quiet stress-free travel (even loud mobile phone conversations aren't allowed). BUT, do not become intoxicated (i.e. drunk) on board (or any other public space in Japan) to the point of being loud/obnoxious/rude/physically violent etc.
While you can bring your own food and drink (alcohol included) onto most trains, many offer some type of food and beverage either for purchase or included in your ticket price.
Talking loudly on trains is considered bad mannered and ranks highly amongst the most annoying behaviors on trains in Japan. Don't talk on the phone. Only on long-distance trains on the decks between cars is talking on the phone acceptable. Set your phone to silent mode.
A gradually decreasing number of shinkansen trains are served by small food carts with a selection of snacks, drinks and boxed meals (bento) which periodically pass along the aisle. Free Wi-Fi is available on board of all shinkansen except on some older train sets in eastern Japan.
The ATC system prevents high-speed passenger train-on-train collisions and excessive speeds. The advanced ATC system exercises complete control over the entire dedicated track and every operating train, preventing train-on-train collisions and excessive speed.
It is considered bad manners to eat or drink inside trains, the exception being on the Shinkansen or other long-distance express trains. The smell of the food offends those around you and there is always the possibility of spilling drinks or food, so please avoid bringing food and drinks into the train.
The train's tilting mechanism to lean into curves at high speed and the high-quality airtight body minimize vibration and provide a smooth, quiet ride.
Exclusive to First-Class PassengersOnce onboard, you'll enjoy complimentary at-seat meal and beverage service provided by our onboard staff of First Class attendants. Selections include freshly prepared chef inspired entrees as well as alcoholic and non-alcoholic beverages.
Tipping in Japan is not expected, and attempts to leave a tip will almost certainly be turned down (a potentially awkward moment). In Japan, it's thought that by dining out or drinking at a bar, you are already paying the establishment for good service.
Eating and drinking while walking in Japan is generally frowned apon. The reason of this is varied, but it is mostly because people usually drop or spill food while walking, making the footpaths dirty.
Hazardous materials, sharp objects*1, furnaces / stoves, animals*2, deceased biological material, unclean objects, objects that emit offensive odors, items that may hurt other customers, and objects that may damage the train are not allowed on board. *1: Sharp objects packed as to not hurt other customers are allowed.