. Railroad construction. Theory and practice . ^ should be grouped togetherand should be as near as possible to the place ^^here through en-gines drop the trains just brought in and where they couple onto assembled outgoing trains, so that all unnecessary running lightmay be avoided. In Figs. 164 and 167 are shovrn two designswhich should be studied with reference to the relative arrange-ment of the yard facilities. 322 RAILROAD CONSTRUCTION. § 300,. FiQ. 167.—Engine Yard and Shops, Urbana. III. i § 300. YARDS AND TERMINALS. 323 I PASSENGER TERMINALS. (Passenger terminals are one of the logica


. Railroad construction. Theory and practice . ^ should be grouped togetherand should be as near as possible to the place ^^here through en-gines drop the trains just brought in and where they couple onto assembled outgoing trains, so that all unnecessary running lightmay be avoided. In Figs. 164 and 167 are shovrn two designswhich should be studied with reference to the relative arrange-ment of the yard facilities. 322 RAILROAD CONSTRUCTION. § 300,. FiQ. 167.—Engine Yard and Shops, Urbana. III. i § 300. YARDS AND TERMINALS. 323 I PASSENGER TERMINALS. (Passenger terminals are one of the logical subdivisions ofthis chapter, but their construction does not concern one engineerin a thousand. The local conditions attending their constructionare so varied that each case is a special problem in itself—a prob-lem which demands in many respects the services of the archi-tect rather than the engineer. The student who wishes to pursuethis subject is referred to an admirable chapter ir ^ Buildings andStructures of American Railroads/ by Walter G. Berg, ChiefEngineer of the Lehigh Valley Railroad.) CHAPTER XIV. BLOCK PRINCIPLES. 301. Two fundamental systems. The growth of systems ofblock signaling has been enormous within the last few years—both in the amount of it and in the development of greater per-fection of detail. The development has been along two generallines: (a) the manual, in which every change of signal


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