We've released plugins for 3DS Max 5, 6, 7 and 8, Photoshop and ACDsee. These plugins, available only to RSDevTools users, allow you to export your 3D models to IGS format, the intermediate geometry format for RailSim.
You can now change the textures and materials on the example models we provided earlier.
The Photoshop and ACDsee plugins give you the ability to view, create, edit and save ace2 files.
Each plugin's zip has installation instructions (except ACDsee - just put the apl in the plugins folder). Max 9 plugins should be available soon.
You need to have registered for the Devtools to get these files.