Tomamu – Obihiro segment will open on 22nd December.
Hokkaido was hit by very severe typhoon in late August. Many train lines are closed by this storm and many trains are suspended currently. Substitute bus service and tentative train are operated but trip time is much longer than original schedule. And also the accommodation of some trains are totally different from Limited Express train interior. It offers just commute train accommodation. It is obviously inconvenient. If you cannot accept this situation, I recommend you to change your trip plan. It may not be a right time to visit there.
Limited Express Okhotsk and Taisetsu take you to Abashiri from Sapporo and Asahikawa. Abashiri is well known as drift ice viewing in winter time. And also when you go to the world heritage site, Shiretoko, you may use this train to Abashiri and transfer to the local train to Shiretoko-Shari. If you need the information about the access to Shiretoko, please see one of my posts, “How to get Shiretoko“.