[Illustration:  PLATE XV.—­Plan and Profile of Lines A and B, and Sunnyside Yards]

For convenience in placing the work under contract, a line was drawn 10 ft. west of Thomson Avenue, dividing the work east of that embraced in the Pearson contract into two parts.  The work west of the line was placed under the immediate direction of George C. Clarke, M. Am.  Soc.  C. E., as Resident Engineer, with Naughton Company and Arthur McMullen, Contractors; Mr. Louis H. Barker was Resident Engineer of the part east of the dividing line, with the Degnon Realty and Terminal Improvement Company as the principal contractors.  The substructures of the several bridges in or across the yard were included in these contracts, but the superstructures were carried out by various bridge companies, and other minor features were executed by other contractors.  More complete descriptions of the plans and of the execution of the work will be given by the Resident Engineers.