They only appeared on the Derry Road on special trains, and within about a 12-14 month period just before it closed. To the end, all normal routine services were ex-GNR diesel railcars on passenger work, and steam on the goods.
I have an idea that an A did a trial run maybe as far as Dungannon, but I’m not sure. No C, B101, 181 or B121 ever went there.