Some people may recall a website called Timetable World. This previously held a small number of scans of British/American/German railway timetables from the 1940s to 1960s.
After remaining unchanged first some years, it has now been updated with an expanded collection of timetables.
More material is to be added, but there is now an Irish timetable on the site, the CIÉ 1983 timetable, which may be of interest to some:
https://timetableworld.com/viewer?token=66d160cc-d943-40f6-be38-842d1602845c#
I believe there are more Irish as well as British and international timetables to