I've found a way to get pictures out of trainz, I did Prt Sc as normal, and while I was typing a paper I hit paste and out came the picture in the middle of my project, easy way to get them into a familiar format.
use paint and say it as a jpeg or get a file conversion software and go to the where the screen shots are stored in you trs2006 trs 2006 folder, then convert it from tga.