Sounds interesting id love to know how you do it. Is the speed calculated based on the noise of the wheels going over a track join? Then you can work out the length/speed based on the time it takes etc. Are the train types/images random or calculated some how?
There is a parameter which tells the program how many pixels there are per meter. From this you can compute the length after stitching. Using framerate, you can compute the speed in the same way.
