I want to buy sleeper tickets for train K7155, which seems to be almost impossible. Train starts in Qiqihar and ends in Mishan. No problem at all to get sleeper tickets for the whole journey, they are available for every date I checked. But I want to get in this train in Harbin. All I could found are hard sleeper tickets for the 15 february, there are no other dates available within the next two month.
Whats the reason why they don't sell any or just a few sleeper tickets from Harbin for this train? Can agencies help to get tickets or will they have the same availability than 12306.cn?