The builder chooses origin and destination within the constraint that all of a company's track must be contiguous.
The following algorithm works for route building:
1) Find the shortest routes between the selected termini.
2) If there is more than one shortest route, select the one that is cheapest. Otherwise if there is only one shortest, pick that.
3) If there are multiple cheapest shortest routes, pick whichever is preferred by the builder.
-- JCL
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