The St. James's Gate Brewery belonging to Guinness had what was apparently the longest private railway system in Ireland. In total there were 10 miles of track of which 8 miles were narrow gauge. There were some interesting innovations included within the system - a spiral in narrow gauge allowing trains to pass under St. James's Street, an ingenious conversion wagon which allowed narrow gauge locomotive to work on the broad gauge sidings, a unique design of narrow gauge locomotive specifically suited to the needs of the site.
This is another post prompted by reading 1951 editions of The Railway Magazine!
http://rogerfarnworth.com/2019/04/26/the-guinness-brewery-railways-dublin
