First 3 meters (9 feet) of laying tracks done!
I used to dig the earth away a little, but a foil down below against weed put around 10 centimeters gravel in and added some concrete plates on. Then I screwed the tracks to them, and finally put some gravel between the sleepers. The result is pretty perfect!

Just to support the electrical power supply, I hide a plastic tube in the gravel in parallel to the tracks. The aim is to connect the tracks every 2 to 3 meters with the parallel power supply – just to garantee a good connection.