What is the system established for contiguous blocks created by railroads called?

The correct answer is the System of Surveys. This terminology refers to the framework used to organize and manage land that has been subdivided into contiguous blocks, particularly in relation to the land grants and surveys associated with railroad expansion. The System of Surveys was critical during periods of westward expansion and railroad development, as it provided a structured way to allocate and document land ownership and use, especially as railway companies needed large parcels of land.

The System of Surveys is significant because it created a uniformity in land management and legal descriptions, assisting surveyors and planners in understanding the relation of different parcels of land to one another and to established boundaries. This structured approach to surveying is foundational to the organization of land in many areas that were developed around railroads.

In contrast, the other options may refer to different land management or surveying approaches but do not specifically define the method used for contiguous blocks created by railroads. Subdivision of Surveys generally pertains to the division of larger land surveys into smaller, legally recognized parcels; Railroad Land Survey System is not a recognized term in the context; and Parcel Survey System could imply a similar concept but lacks the specific historical and legal framework that the System of Surveys provides in regards to railroads.