Ah, I see what you mean.. yes, it is moving in 2d, moving horizontally across.
I create the drawing in photoshop, I see how I could create it from a few drawings each one consisting of a few railroad cars. But could AE handle so many layers ? I assume that to have it accelerate from zero to a motion blur over 60 seconds, with each layer consisting of about 8 carts, will require quite a lot of layers. Some hundreds I guess.
I could divide this scene to a few smaller ones.. but the motion should look continuous. So handling the keyframes from one scene to another while still needing to keep the look of one consistent acceleration seems to be another tricky part.
Thanks,
Y.