Yes, she double-headed with 100 on the Courtmacsherry to Clonakilty Junction section. They had retained a five-coach set of 45 or 48 ft bogies of GSWR origin (replacing an earlier set of clapped-out Bandon stick) for these excursions, as longer bogies couldn’t deal with the curves on the branch.
I assume that a “proper” engine brought this set from Cork to the junction - if 90 & 100 had taken the excursion the whole way, it would still be on its way back today….
90 hauling a train always looks to me like an N gauge engine on someone’s layout - hauling 0 gauge coaches!
I lit 90 up once before it left Whitehead for Downpatrick. I am of average build, but I felt like an 0 gauge driver being out in the cab of an N gauge model; the good people of Castleisland, for whom it was built, must have been marginally smaller than hobbits or leprechauns.
Or possibly, Inchicore’s 3D printer was set to the wrong scale when they built it.
For people built to 1:1 scale, or 12 inches to the foot, this thing is an utter monstrosity to oil, especially compared to the equally minuscule, but way better designed, CSET Sugar locos. You have to be a contortionist underneath it.
I wonder what crews thought of them - I suspect that opinions might have been less than complimentary!