As you do not want to use script, you can look at my scene, this one
http://www.algodoo.com/algobox/details.php?id=42016, note that the system is up and down the stairs, it's kinda complex but you can at that time, I have not used script, now I use variables with springs, but since you do not want to script, here it is a good solution ... Bye
First thank you to comment, and second the box on the roof is just a eexample , and third , this loader has 7 gears, you can take a look at the official pdf document with all the specifications
http://forestpro.cat.com/cda/files/238187/7/TH330B_Prod_Bul_TEJB9115-01.pdf ... and the arrow is fast because i used springs, and i can't change the speed...
Shot-me you are right, your monster trucks are awesome and very good detailed, but, the thing is my track has a lot of things like, time couting, a start light and all of this...