Initial train lengths consisted of three class 9E electric locomotives, hauling 210 type CR ore wagons with a payload of 80 tons.
Upgraded wagons now carry 100 tons. Train lengths were increased in 2007 to 342 wagons, employing Radio Distributed Power (RDP) technology.
These trains (initially with 10 locomotives, a mix of electric and diesel-electric) and 342 wagons have a total mass of 41,400 tonnes and are 3,780 metres (12,400 ft) long, the longest production trains in the world.
The same 342-wagon trains are now powered by just five
15Es, crewed by one driver and one assistant.