Straight Rails fir Gravitrax - Normal version

Here are four straight rails that can be used with Gravitrax, each spanning 1 to 4 tiles. The length is approximately equivalent to that of the original Gravitrax rails.

Note : I'll be uploading separately some rails that are 1 to 3 mm longer, making them suitable for steeper slopes. (a little bit longer rails are here : https://www.printables.com/model/1083775-straight-rails-for-gravitrax-longer-version/files )