Hi Andy,
All the TT rails upto TT6,8 are as the book, TT1 and 7 stop just after TT6 uprights where the new TT1a and TT7a are cut and placed to meet BR12 and SB3 as book but a little wider for the diff input. The amended lengths are shown in red on the CAD jpg's on the guide.
There is a revision 3 going up onto the web page, just waiting for the web host to upload it for me.
AndyH
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