(plaintiff contracted to sell potatoes to defendant and claimed that defendant breached contract, and defendant brought counterclaim that plaintiff breached contract; both parties sought summary judgment and defendant claimed that plaintiff was required to build railway spur via contract so that potatoes could be loaded on railway cars the defendant supplied; court determined that contract required defendant to furnish railcars or trucks to take delivery of potatoes and that contract did not give defendant to take delivery solely by rail or require that plaintiff build private spur to deliver potatoes).