Some part of winter season is the busiest period. Especially in Japan, New Years holidays are crazy busy. In this season, December 28 to 31, January 2, 3 and 6 are expected to be the busiest days. I recommend you to avoid getting a train on those days. The vehicle occupancy rate may be more than 200%. As long as trains have non reserved seat, you can get on anyway without any reservation. But you will be forced to stay on the isle or passenger’s deck without seat. There are many passengers without seats in the train during those busiest days.
As probably you know, it is icy freezing weather in Hokkaido and north part of Honshu island (Tohoku region). If you travel in these cold weather regions, please expect the delay due to snow or high wind. Please have time to spare in your itinerary. Don’t make a tight schedule.
Anyway JR Group operate lots of seasonal trains during all winter season. But it is too many to introduce all seasonal trains. So I pick up the popular trains and are operated in the popular spot. Continue reading Schedule of 2012-13 winter seasonal trains of Japan Railways