[PRCo] More interesting links referencing PRCo

[Matt Barry]

My apologies if these were posted in the past.  But even so, they're 
worth a second look...

Matt

http://www.amatecon.com/etext/lpls/lpls-ch7.html

http://lyttonspccs.homestead.com/pittsburgh.html

http://www.mychromalox.com/capabilities/history/default.asp

http://moa.libraries.psu.edu/images/PSt00000733a_a.jpg

    The above is:   Lowries Run Viaduct. Warren truss viaduct, west of 
Allegheny, Pa., built 1906. Pittsburgh Railways bridge crosses Lowries 
Run. Photo by C. K. Mohler, 1906.  Document for this building contract 
is here:  

http://moa.libraries.psu.edu/images/PSt00000734a_a.jpg

http://www.rapidtransit.net/net/thirdrail/0007/fares1.htm