the red lines are paper strips,
the red dots are the pieces of the straightened paperclips and
the black lines are the track links...
yellow is the glue (I used "UHU" universal glue)
The thing you don´t see, but is the most important part is that you put on one link 2 strips of paper, while you put 1 on the next, positioned between the two...
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(Of course you glue all the stripes on the back...)
the reason behind this is that this allows you to put in the steel rods, held by 3 paper strips, 2 from the one side and 1 from the other, while one link holds 2 strips to both sides, while the next holds 1 to both sides open, which makes it 2 times faster to make and 2 times more stable...
...and here i made the next big mistake: you can imagine, that if one link holds only one strip, it would become unstable to the sides, which you can avoid by making the middle stripes bolder and the side-ones thinner, making it more stable in the event...
...or you compensate the spared time and make it with 5 instad of 3 holding strips, making your life to hell, but achieving the ultimately strong track with no unstability and looking more realistic as well...
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Don´t forget to push the steel rods in the spaces, which should be a little bit wider than the rods, allowing them to move freely later...