2. General view in switch room of tower showing mechanical interlocking levers. - Northwestern Elevated Railroad, Interlocking Tower, Wilson Avenue, Chicago, Cook County, IL

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2. General view in switch room of tower showing mechanical interlocking levers. - Northwestern Elevated Railroad, Interlocking Tower, Wilson Avenue, Chicago, Cook County, IL

Digital ID: (None) hhh il0381.photos.060784p http://hdl.loc.gov/loc.pnp/hhh.il0381/photos.060784p
Reproduction Number: HAER ILL,16-CHIG,107A--2
Repository: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print

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2. General view in switch room of tower showing mechanical interlocking levers. - Northwestern Elevated Railroad, Interlocking Tower, Wilson Avenue, Chicago, Cook County, IL