https://www.youtube.com/watch?v=nHqgLA9n50A&feature=em-uploademail
Great idea with the legs for the guy pushing.
The one after that where the water goes in the tender at about 42 seconds into it is cool. I guess he is using some kind of clear substance that retracts back into the pipe.
https://www.youtube.com/watch?v=iVid32L_gFc (https://www.youtube.com/watch?v=iVid32L_gFc)
Reiskoffer wedstrijd = suitcase competition.
Ton