[PRCo] Re: voltage and frequency

[Jim Holland]

http://www.americanheritage.com/articles/magazine/it/1993/4/1993_4_46.shtml
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O~R -- http://tinyurl.com/ywxaw3
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"""In 1896 Bion J. Arnold designed a system of three-phase 
alternating-current (AC) transmission that greatly reduced losses. The 
system was installed in 1898–99 on what became the Chicago North Shore & 
Milwaukee,..."""
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-- 
*Jim Holland*

Studying *Pittsburgh Railways Company*

....................From 1930 -- 1950

*Pennsylvania Trolley Museum (PTM)*

http://www.pa-trolley.org/

*N.M.R.A.*

http://www.nmra.org/