Curve Modifyer Problem (Rollercoaster)

Hello Blender Community,
for a school project im trying to create a Rollercoaster.
I found few helpful tutorials like this one below.

Although this is not supposed to be a hard project I struggle
at one point a lot.
The Rollercoastertrack created by an array modifyer does not follow the path of the Beziercurve.
Not one of the axis does a better job than the others.
Can anyone help me?
Its really important, time is running.

select both objects and press Alt+G to reset position and Alt+R to reset rotation… then try X axis