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This paper briefly reviews past policy of the Interstate Commerce Commission toward railway abandonment and the changes in federal policy with regard to abandonment provided by the 3R and 4R Acts. The results of the listing of candidates for abandonment by the railways are noted, and the information relevant for abandonment policy provided by impact and cost function studies is summarized. The role of state rail planning is noted.
Three new iterative calculations which converge to the ratio matrix of the discrete generalized geometric distribution are presented for queuing systems having this limiting distribution. Two criteria for convergence are provided.