... 12" beams. For 60' rails, these chairs are all placed at 2' centres. Looking at the picture it seems to be M1 chairs, as there's no checkrail visible, and M1/L1 are distinct enough from S1J chairs. On diagram 107 there are two "chairings", with the 2nd chairing showing the use of a saddle chair (either S1 for S1J/L1CC arrangement, or M1 for the M1 arrangement) under the fishplate. This looks most interesting, so I knocked up these renders. 499_040542_180000000.png 499_040543_250000000.png posted: 4 May 2018 17:13 from: Andrew Barrowman So that's why they are called bridge chairs! Nice 3D model. Are you going to have it printed? Cheers! Andy posted: 5 May 2018 10:33 from: Judi R That's a beautiful picture! Only one niggle, I believe the fishplate bolts should be placed with the heads in the 4-foot. Judi posted: 5 May 2018 20:12 from: Rob Manchester Judi R wrote: That's a beautiful picture! Only one ...