File:Electric railway journal (1914) (14781335363).jpg

Identifier: electricrailway431914newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
or systems. Supply systems there might be tied minimum clearance in the Lotschberg tunnel. Theclearance between any live point on the pantograph andthe tunnel vault would be 250 mm (9.8 in.). The con-tact line would be carried from straight-arm bracketsplaced toward the axis of the tunnel, and the line wouldbe hung through five or six multiple chain insulators.A chain of insulators of the type proposed had with-stood 180,000 volts dry. He did not think that it wassatisfactory to use insulators of petticoat or groovedtype to obtain the completely independent insulation ofthe contact lines of each track. To avoid the unpleasant consequences of a train be-coming stalled in the 9V2-niile St. Gothard tunnel afeeder wire would be so placed between the trolley linesthat an auxiliary current collector could be run underit in emergencies. The use of steel for contact wire, he said, was almostunknown in Europe. With steel contacts on the col-lector and running at high speeds, the steel wire ap-
Text Appearing After Image:
Prolile of St. Gothard Railway Between Chiasso and Lucerne—Distances in Km together for emergency purposes, but not for obtaininga diversity factor. In fact, the railway circuits werelow frequency, say fifteen cycles, while lighting andindustrial circuits were fifty cycles. Frequencychanges were too inefficient and expensive for generalinstallation. In the case of steam plants, it might pay tohave a common station, not for the sake of the diversityfactor, but for the sake of having a larger and conse-quently more economical plant. In Switzerland, how-ever, the size of a plant was limited strictly by thewater supply, and the interconnection of plants for eventhe same service was simply an operative precaution orconvenience. The same conditions might apply tosome hydroelectric developments in the United States. An important advantage of the voltage control of thesingle-phase system from the power station viewpointwas that the starting of trains did not cause such sud-den and high peak

Note About Images