The jpegs created by Trainz can have IPTC data embedded in the file. I just looked at one I made in TRS22 and at the moment there is no data listed but the slots are there. Trainz could be modified to store all kinds of data. If you have IrvanView, open a screenshot and press the "i" key. That opens the information window for the image. In the lower left is a button for IPTC info. Press it to see the information stored with an image. My cameras store info like GPS coordinates and camera settings in that area, so Trainz could store all kinds of information.