Now for the details: The left side tandem has a Bionx electric assist generator hub and on the top of the kids trailer is a set of solar panels which is powering a small fan inside the trailer, helping keep the little passengers inside a bit cooler.
I wonder if Mom and Dad up front would notice if someone stopped pedaling. I guess that's when the electric motor comes in handy.

Off they go!

Watch out Mr. Hipster!

All aboard!

Final check