Most likely the work of retouched images. Notice the views for a particular item are always the same. At one point by accident there was an image of a completely undecorated Lionel diesel loco on their webiste, will have to see if I can find it again.
On the other hand, 3D CAD models that are rendered in software like Keyshot can have amazing results. I've used rendering programs like Keyshot, and the results can look just as convincing as the real item.
