https://mcfarlane.com/news/12-days-of-giveaways-2017/

Xming for X server windows work. Although I’ve been meaning to try out VcXsrv.

Thanks for the replies.
Using the audio editor works pretty good.

We ended up putting a small metal bucket at the end to make a good bang when the test car hit it.
Initial testing went exactly as expected.
From slowest to fastest.
no weight / front / middle / back.

https://www.bloomberg.com/news/articles/2017-09-27/equifax-will-offer-free-credit-freezes-for-life-new-ceo-says

I found a decent idea here
https://www.abc-pinewood-derby.com/android-timer.php
They are using an audio editor and making a distinctive noise at the start and when the car crosses the finish line.

Then finding the time for the noises in the recording and determining the run-time for the car from that.