I think you are spot-on there.StevieG wrote:So, noting that there's no disc showing for setback into the sidings, and analysing all the numbering, I wonder if 16's been drawn the wrong way round, and is actually for a setback through either 17 or 19 - that would fit in very nicely to usual frame layout numbering, and avoid any need to pull a lever between its already-Reversed immediate neighbour on both sides.
I have palns for 1892, 1893, 1908 and c1935 and they all show the signal as a set back.
A surprising error to get through "quality control" but you (StevieG) will remember a plan I showed you recently from further down the line that had the wrong number on a distant signal so errors certainly did get through.
Best regards,
John