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The Wharton Safety Switch - University of Denver
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The Wharton Safety Switch - University of Denver
Website URL:
http://mysite.du.edu/~jcalvert/railway/wharton.htm
Category:
Printers Fax Machines
The Wharton Safety Switch. ... The Wharton switch was introduced in the 1870's on the Pennsylvania Railroad as a switch that did not require that the main-line rails ...
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