Nice post, in South Africa we have a narrow gauge train that is even narrower!! You can check it out by following the links.
https://en.wikipedia.org/wiki/Avontuur_Railway#:~:text=The%20line%20was%20best%20known,a%20SAR%20NGG16%20Class%20Garratt.

https://www.appleexpresstrain.co.za/