The only pieces of coach seating I had to hand were the remnants of some originally longer, injection moulded seat strips bought perhaps 15 years ago at an exhibition. I cannot remember the supplier or maker, but if anybody recognises the stuff I'm curious to know.
This was clearly only suitable, as it was, for long bench-type seating in compartments, but after cutting it carefully into square-edged pieces, of appropriate widths, adding bits of plasticard, filing to shape and further blending in with generous amounts of brushed-on solvent, I managed to create something that was at least generally similar to the seat shapes I could deduce from photographs and drawings.
Single, wide first class dining seat (for sumptuously upholstered occupants?)
Double, narrower seats for one side of the aisle to suit third class diners
Same parts separated to serve as single dining seats for thirds on the other side of the aisle (a little additional rounding of one top corner will be needed)
While I had also been working on an adaptation to some old turned carriage buffers with large round heads to try to represent the oval-headed, retracted form of the GN retractable carriage buffer, as shown below, I've now received a better image of one of these, and a couple of drawings, which suggest to me that if I'm going to make my own I really need to start these again.....