Gents... re, first, Sulzer workings: B113/4 spent most of their working life around Dublin, after their initial performance, when newly built, on the main line to Cork met with mixed receptions. In later days, in between lengthy spells in Inchicore they were used on North Wall / Heuston transfer freights. After 1960 i am pretty sure they were never used on passenger trains at all (not to my own memory anyway), and probably not much - if at all - after the introduction of the first AEC railcars, and later the "A" class, on main line links. The B101s were always synonymous with Cork - Rosslare, where they were regularly used on goods and passenger traffic. They were also to be seen on the Limerick - Sligo line from time to time with goods trains, but I am unaware of a single instance of them hauling a passenger train on this route. They made some appearances on the Tralee - Limerick route too, and almost certainly with the Limerick (via the Croom branch) to Cork goods, which ran until 1967. They were also used on the main line Dublin-Cork. The last ever passenger use of one - by this stage years and years after they had featured on any sort of passenger usage, was the 1978 IRRS farewell trip from Connolly to Bray with 106. I was lucky enough to get a cab run on that. The loco used, the last in traffic, failed very shortly later and was withdrawn. I could be mistaken, but I think I have seen a pic of one on a Dublin-Dundalk goods, but they were certainly unknown in UTA territory. I daresay they might have made occasional forays onto the Midland or DSE, but this would most likely have been on ballast trains or the sprayer. They also might have worked Dublin-Waterford via both Athy and also Abbeyleix - but I don't think they were ever regulars there. If I can glean anything else I'll post it here. They were very much "southern" engines.
And as to a book, Lough Erne... I was approached by a colleage about a year ago who had some very good ideas about such a thing, and I said I would collaborate as and when time permitted. Your post prompted me to contact said person again this afternoon, and I'll be meeting another guy on Thursday night........ watch this space. It was indeed a very interesting period. I suppose I might use this forum to ask anyone out there with pics of anything particularly old (within 1955-70) or particularly new within that period, to gimme a shout...