... semi-curved switch, not a straight switch -- otherwise the size of the heel offset doesn't make sense: semcu_sw.gif Also the length of the switch rails and reference to the "first fixed chair" firmly suggest that it is a flexible switch, even though the drawn arrangement for the open switch rail appears to indicate a loose-heel switch. You would need to check photographic evidence for this. Here it is matched to a 1:7CLM generic V-crossing in P4( .box file attached below): 2_231927_370000000.png As often with pre-group drawings the dimensions don't quite add up -- the quoted 470ft radius appears to mean the internal geometrical radius of a full turnout, rather than the actual switch radius in the rail. I had to set the switch radius to 441ft-6in (5298") in order to get the quoted heel offset. The timber spacings all worked out to round number inches, with 26" spacings at the rail joints. Here's the full custom switch info printout: Dimensions for LSWR Type 2 Switch ...