I love Garratt's, especially the South African NG-16's.
One of these has been widened to 30 inches by the Puffing Billy in Australia and the total rebuild is nearing completion. The latest news is a mid-2019 completion is the expected date for it to be finished or go into operation.
Here is a link to the latest update with photos.
http://puffingbillyworkshops.blogspot.com/2018/05/the-ngg16-countdown-begins.html