I'm not sure. Our small island with a tiny population, predominantly agricultural back then, few large urban centres, very little heavy industry, unlike our european neighbours who had many large urban populations for 100s of years to connect. Also there is a difference between economies that have achieved relatively recent income wealth, as opposed to those also who have had capital wealth for hundreds of years (e.g. France, Germany, UK, Sweden, etc), and have therefore been able to invest in infrastructure to support their large populations.
Ireland may be listed in international economic league tables as a comparatively wealthy country in terms of quality of life and household income, but compared to long developed economies is still a relatively poor country in terms of capital wealth (public and private). Our population has been and remains very small. (now if that is a good or a bad thing is a separate question and has nothing to do with a model rail forum).