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Caution! What you need to be careful when riding on Shinkansen at year’s end or new year season. (crazy congestion)

If you unfortunately didn't have time other than year's end season (about Dec.28 to 31) / new year (Jan.1 to about 7) to trip to Japan, you should be careful not to be caught in toooooo crowded Shinkansen. For example, if you wish to go tr…