One of the 2 ALMA transporters

The ALMA antenna transporter is motorized by 2 powerful engines of 500 kW each - i.e. as much as twice a Formula 1 engine - that drive each of the 28 wheels individually. These powerful engines are necessary to climb the 10% slopes that exist on the Chajnantor site and to bring the 240 tons of the vehicle and antenna from the 2900m high base camp to the observing site at 5000m altitude. The transporter has a power generator on board to keep the antenna and its cryogenic systems sufficiently cold while being transported.

© ALMA (ESO/NAOJ/NRAO)