Its a Droid and it sort of walks.
I used the NLA editor to combine left to right translation with a repeated walk cycle.
The result is unconvincing as at points of the walk cycle the feet appear to slide along the ground. I guess I need to interleave motion with stationary periods on the LeftRightMotionAction.
When rendered in Cycles, which I had to do to get the mirror in the cylinder working, the legs, supposed to be made of plastic Meccano, also show an incorrect yellow/black pattern. They look ok rendered in Evee.