The story
Bradshaw's Guide shows the 1895 service: there were four trains throughout the line on weekdays, with two additional trains (three on Saturdays) between Denbigh and Ruthin. All the trains called at all stations.
There were three goods trains on the line daily in the 1920s, but this seems to have been exceptional; one a day normally sufficed later.
From Wikipedia’s article on Denbigh, Ruthin and Corwen Railway, shared under CC BY-SA 4.0.3