Answer:
The Congress reduced the prices of land used as railroads below market value.
Step-by-step explanation:
The US government assisted during the construction of the railroads between 1860 to 1900, seeing railroad as an expensive project, the Congress assisted the railroad companies by giving them land grant, they gave them acres of public land in millions so that they can build their railroads. The Congress saw that this will aid the quick settlement of the West. This lead to the building of four transcontinental railroads.