I'm pleased that my backdrops got a mention, and I must say how grateful I am to the tutorial mentioned in the last post and especially to tafweb's tutorial on making trees for TRS2004, which was my main source of guidance in starting to make backdrops,
Provided one has a suitable photograph or photographs, the process is quite simple. My 'trees' backdrops are in fact made from just one photograph; a range of rural backdrops which I'm working on at present is made from four simple panoramic shots across meadows towards distant trees and hills. The photographs were taken with a fairly basic digital camera - it must be fairly basic, since it's now ten years old - but it serves the purpose very well.
I'd be happy to give a brief description of how I work, but it wouldn't add a great deal to the tutorials mentioned above. The two things to remember are a) two images are needed - colour for the backdrop itself, and greyscale/black and white only for the opacity rexture (to leave the Trainz sky showing), and 2) to make sure that in the texture.text file, 'tile=none', otherwise a hard edge will be seen at the top of the backdrop.
Ray