In 1947, the idea originated to build 176 two-armed self-discharging wagons that could be connected in pairs. The maximum speed of these wagons was 65 km/h. In 1979, it was decided to sell the wagons. This meant going back to the drawing board, since the Eds-wagons – which had been proposed to substitute the two-armed wagons – proved to be a good replacement. After a development trajectory of a few years, the first eight hundred Fccpps-wagons were launched in the late eighties. Let’s travel in full speed to 2005.
After the shift from Maas-grind to quarry stone, the question arose how to solve the problem of quartz dust, which is released when unloading ballast. This resulted in the design and construction of the SALT-I in 2005. In 2013, the SALT trust was established through a collaboration between ProRail, the contractors, and Railpro to fund the conversion of the wagons. Meanwhile, further step-wise enhancements were made to the SALT-I wagon, which ultimately resulted in the SALT-III wagon.