I suggest before photoshoppin around too much, get that first image of the train in game, making sure it works. If ye can get that, post a side/side comparison via screenshots to compare the difference and if it seems worth the effort, then get to work on a whole lot more.
I'm not great with photoshop, but asuming you use a similar method for each image to enhance the quality, perhaps provide a step by step tutorial for people so we can quickly all send in work (make an agenda and designate work to different people), and it could all be sent to someone who could put it together as a patch. I'm out on a limb with this and it may take a bunch of work and each image will need specific work done on it, just putting out the idea.
Anyhow, get us some shots, as its more important to be able to get them ingame.
Keep up the great work!