I would agree. It’s the only period where you such a huge variety of stock, plus both steam and diesel. Many, many one-off local operations like the two horse tramways (Fintona and Shannonvale); brand new modern diesel railcars, coaches, tin vans and wagons, operating not just alongside; but intermingled WITH, stock which in a large number of cases was pre-1900, even in a few cases pre-1880.
Some locos and rolling stock long predated the actual lines they were running on, while others were so new their classmates were still being built in Inchicore.
And with so many branch lines still open - even on the basis of a thrice-weekly goods and little else - you’ve a modelling prototype for anything.
And several narrow gauge lines are still operating. Donegal and West Clare railcars were able to glimpse new shiny tin vans and new “H” vans across the tracks at Strabane and Ennis.