Start by reversing the engine into the bottom part of the track loop, then switch the junctions and move the engine backwards into the siding on the far right of the screen.
If you followed Hint 1 correctly, you should have picked up the two railcars automatically. Pull the railcars out of the siding and up into the middle of the top track, between the two junctions.
Uncouple the red railcar and leave it at the top of the track loop. This makes it possible for your engine to have one railcar on either side of it, just like the one on the top track.
Switch the junctions and make an anticlockwise loop towards the red railcar. This allows you to couple the red railcar to the front of the engine.
Now then, that should put the railcars and engine in the correct order, but is that the only requirement?
Solution
Correct
Choo-choo!
Driving trains really is a most gentlemanly pleasure!