Paint Shed is now obsolete. The original program was developed for use with earlier versions of Trainz and used specific templates. The models that were reskinned with it were okay, but never great due to the limitations of the templates and the original built-in content which they were based upon. Add to that the difficulty in creating additional templates for other models only made it a dead-end product which died when I believe TRS2006 came out, but I maybe mistaken on that detail. This isn't saying that none were created though but they are far and few between.
Reskinning is a matter of editing the image files supplied with the models using programs such as Gimp, Paint.net, Photoshop, or even PaintShop Pro. The process takes time and some practice, but it can be done. If I can do it, you surely can do it too.
