After a few requests, I have now taken the time to make a parts list and Rebrickable instructions for this power car MOC, which you can find here:
https://rebrickable.com/mocs/MOC-191260/Minifig_Jez/power-car-for-downtown-tram
As soon as I saw the images of this set, I knew that I wanted to modify, motorise and lengthen it.
And I'm really pleased with the result !
You can see the video of me changing the 60337 Express Passenger Train set, from Green to Red here: https://youtu.be/qpeWAHSYHFo