When you go to Wakkanai at North end of Hokkaido, these trains take you there. Soya (宗谷) and Sarobetsu (サロベツ) take you to Wakkanai. Soya is operated between Sapporo and Wakkanai. But Sarobetsu runs between Asahikawa and Wakkanai.
This train has not run in the last few years. Please do not use this train in your trip plan.
This is a seasonal operation of Limited Express Okhotsk that connect Sapporo (札幌) and Abashiri (網走) in Hokkaido. This train is operated from late January to early March for Ryuhyo (流氷=Drift ice) viewing. The operation, like time required and route, is completely same as Limited Express Okhotsk. But this seasonal train is operated by specialized car. The accommodation is much better than regular train of Limited Express Okhotsk.
Furano is one of most popular spot in Hokkaido. Especially July is the busiest season because the bloom of Lavender. You can enjoy Furano in not only summer season but also autumn. You may see the fall color leaves in September. The scenery in autumn is breathtaking too. Furano can be accessed directly from Sapporo by Limited Express Furano Lavender Express / Furano Koyo Express from July to mid October. There are three round trips in the peak season. But if you want to have a nice rail excursion and enjoy the scenery from the train, I recommend you to take this train “Furano Biei Norokko train”. Of course you can take this train by Japan Rail Pass with no extra charge. Let’s see the details about this train.
These limited express trains, Kamui and Lilac connect Sapporo (札幌) and Asahikawa (旭川). Kamui and Lilac run on exactly same route. The only difference is accommodation. Lilac has Green seat and Kamui does not. But the reserved ordinary seat of Kamui is called “U seat”. It has better seat with some equipment. But it is a sort of Reserved Ordinary seat. So even Japan Rail Pass Ordinary can be used to take this seat.