The answer is clearly
Cars
Because
That is Lightning McQueen. He is pulling the train which is similar to the moment in the movie Cars when he has to pull the paver to pave the road. The train track is difficult terrain for the car, just like the unpaved road was for the car. The train is similar to the paver because it is a heavy thing you wouldn't expect for a car to pull.
The clock is symbolic. The first time McQueen paved the road he did it too quickly and messed up -- the second time he had to take his time. McQueen is literally bringing "time" with him in the picture.
A picture of the scene I am referring to:

This is correct and not a joke.