The "plane's shadow" (you think) you see isn't actually the plane's shadow at all. It's from the locomotive or possibly a large passenger car. The other cars are just lower, and it's either early morning or late day. If you look at the pole in the lower right, it's shadow stretches across the brush, one set of tracks, and then touches a second set spaced well away.
In fact, that shadow is what makes the whole illusion that the plane's on the ground, because it is kinda in the shape of the nose of the plane due to the way the terrain has bent it. If you look, however, it has some very sharp angles to it that the plane would not have if it were on the ground.
The other half of the illusion is also due to the compression as mentioned above.