... golf events at St. Andrews. So NBR rail and chairs still in use nearly a century after the end of the NBR! I'm trying to work out the logic of the asymmetric chair. Had the jaws been at the inboard end of the joint, I might have thought that it would have allowed even spacing of sleepers through the joint, facilitating mechanical tamping, but I would be staggered if the NB had that in mind. The thoughts of others would be illuminating. Now, who's going to build the model!3072_201638_000000000.jpg 3072_201640_060000000.jpg posted: 20 Apr 2017 22:20 from: grahamroberts Bruce, that's fascinating, and these are great photos. Thanks for posting them! Graham posted: 21 Apr 2017 10:49 from: John Palmer Thank you for posting these interesting pictures. How good it would be if someone would produce mouldings of the distinctive North British chairs! To me, the obvious intention of the design of these joint chairs is to make it possible to reduce the pitch between the sleepers on either side of the joint from 24 ...