... , Yes, there is a left and right bracket casting for each crossing angle. I'm just scanning a drawing, will post later. cheers, Martin. posted: 9 Jan 2018 23:15 from: Martin Wynne Hi Andy, Here are the scans. 1. REA. Sorry it's scanned from a poor photocopy. Built-Up "A" Chairs, C.I. (cast iron) Brackets: 2_091756_280000000.png Here's the link for the full-size scan: gallery/2 /original/2_091756_280000000.png 2. GWR: 2_091811_010000000.png Full-size scan: gallery/2 /original/2_091811_010000000.png I'm sure I have a drawing of the REA slab somewhere but it's not to hand. It's 1.3/4" thick (the slab, not the drawing). REA. Or 1.7/8" thick. GWR, as shown on drawing. M.S.= mild steel. regards, Martin. posted: 10 Jan 2018 00:31 from: Andrew Barrowman Great! Looks like the bolts are always perpendicular to the center-line of the crossing ...