The Mindstorms EV3 Delta robot will be used to load the wagons. A first run can be viewed on Youtube:
A completely new delta robot has been build for Lego World 2017. The robot is based on the ABB FlexPicker Robot. You can read more about building the Lego Version at Eurobricks.
I have written a small test program for picking up a container from a pre-defined place. It is still a bit slow, but it works.
For 2017, we are building a robot arm with 6 degrees of freedom.