This article does not give a date, but describes the trolleybus system in Anju to have opened around the new year.

It also talks about two routes: one from Chilsong Park to Anju Silicate Brick Factory (the easternmost part of the one-way loop at Namhung) and from Anju Hotel to just past the Chongchon Bridge.
The article also describes the future extension of the trolleybus, from Sinanju to the silicate brick factory.

Source: Minju Choson 1988/03/04