And, significantly, they were made by George Stokes' method of twisted wire. Now, I'm sure we can't now get hold of Tiger Moth flying wires, or more correctly, control cables, but any nice wad of wires will do. Fine ones, so that you slowly unravel to get to the last fine bits of twiggery, having gone through trunk, split trunk, limbs and secondary limb groups finally to get busy little groups of fine twigs to which the foliage, if you really MUST have it, is attached.
Stokes modelled winter. Dark skeletons being stifled by creepers. I have seen very few summer trees with a convincing foliage. In fact, to this day, I have seen very few really good trees on model layouts. Most, if compared to a loco or wagon, would be as a tank loco with no underframe detail and a big old motor in the cab driving solid wheels or a wagon with no brakes and and a bogus livery. Nobody, even the R-T-R mob would dare do that these days, yet trees are still blobby green and brown lollipops, often, calamity of calamity, made of lichen! An instantly recognisable awfulness of nature which is suitable for nothing scenically. Surely people can see that at a glance.
Here are some trees on a typical modern model railway:-
Lollipops and bog brushes. But I bet all those locos are bang on.
This what a model tree should look like:-
Note the crows' nests are high? A good winter to come.
It was George who said "you can't invent a tree". He went out and sketched the tree he wanted to depict in scale, measured it, photographed it and made it as accurate as most people make a loco.
George, we miss you still.