Model Railway Enthusiasts
stick to add your led tester to see if you have power to your track, simply glue your tester in the cut away section. 
less fiddly.

Model Railway track voltage tester v1.stl

this is an template for the arduino uno r3 board by elegoo made to measure so if you need to build your own enclosures this will help.

pulled mine off before bed cooled but is correct.

arduino  v2.stl  template

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Model Railway track voltage tester v1.stl

arduino v2.stl template