The 3m-high containers will be dedicated to the Nightcaps -Temuka service which carries coal from the Takitimu mine in Southland to the South Canterbury factory of dairy company Fonterra. The containers will be delivered in time for the start of the next dairy season on August 1 and will complement 80 new HCL containers added to the fleet in 2010. The investment comes as KiwiRail completes a major year-long refurbishment of the Nightcaps branch line, which involved laying new sleepers and ballast. This has boosted the line speed from 25 to 40km/h.