I grew up in a place known as 'The Works'. It was (still is) in Dublin, and was for many years where most railway engines and rolling stock were made in Ireland from the 1800's till today. It emcompassed a large area and had its own housing estates, school, shops etc. Down through the years they had 'open days', very few, but they gave the locals a chance to see what their respective family members had been up to behind the closed gates during working hours.
I was at one back in 1969 and remember seeing armoured cars on display. Long since gone, but I'm sure these photos will be of interest.