Bridge for Chinese Magic Track

Bridge for MagicTrack.
The width of the car 4cm.
Total width of the road 6cm.

I...I.....................I...I thickness=13,5mm
<------ 60mm ------>

Can be scaled for other model traces. Please inform me the scale coefficient in case of successful printing.
Approximate (untested) scale coefficient for:
I...I.....................I...I thickness=17mm
<------ 73mm ------>
K = 1,26