Well if its on Wikipedia it must be true , I said 1979 from my recollection , i was on a IRRS visit to Inchicore Works on July 1979 and that was the first occasion I and a few others came across them sitting there lined up brand new having just arrived , the only loco adapted to work the time was 189 with the rest of the fleet being adapted over time except for the A class . Over the years you would see up to 11 of them in one train never saw 12 myself together there was always one in for repair or spare . I also remember a member of staff in Limerick telling me that they were difficult wagon to completely discharge(compared with the bubbles) with cement being left at each end and building up over time I think they last worked in Dec 2009 on the Limerick -Waterford cement.