JS 5431 approached the summit on the Wuyiling branch, north of Nancha, with train 576/574, the 12:49 from Yichun to Shenshu, on the afternoon of 6 April 1988. The line had been worked almost exclusively by JS Class locos a few years previously but by 1988 they were being replaced by QJs. It's possible that the smaller locos remained in charge north of Yichun for several more years but as visits by enthusiasts were rare, we will probably never know.