Used to replace, and complement existing systems. It is also used in new installations. The 400 Series is designed around a 3 piece welded design. 400 series systems transport loads up to 10 tons. Equally balanced between weight and strength, 400 series equipment can be flexibly applied to meet any complicated track layout. The 400 series can be bent to create a wide variety of curves or connected to a series of switches to help you position your loads where you need them without the need to switch trolleys.