What are Ports of Auckland's new automated carriers?

Ports of Auckland has had a torrid past few months, with increasing pressure from importers and retailers to speed up stock movement through the port.
The company insists the delays are due to staff shortages, despite worker's telling Checkpoint the move to automated straddle carriers to shift containers is to blame.
We sent reporter Nick Truebridge and cameraman Nick Monro for a morning on the wharves.